diff --git a/ConfigForm.ps1 b/ConfigForm.ps1
new file mode 100644
index 0000000..ee8495a
--- /dev/null
+++ b/ConfigForm.ps1
@@ -0,0 +1,24 @@
+Add-Type -AssemblyName System.Windows.Forms
+
+$configForm = New-Object System.Windows.Forms.Form
+$configForm.Text = "SharePoint Configuration"
+$configForm.Size = New-Object System.Drawing.Size(400,300)
+
+# Add controls for all configuration fields
+$lblSiteUrl = New-Object System.Windows.Forms.Label
+$lblSiteUrl.Text = "Site URL:"
+$lblSiteUrl.Location = New-Object System.Drawing.Point(20,20)
+
+$txtSiteUrl = New-Object System.Windows.Forms.TextBox
+$txtSiteUrl.Location = New-Object System.Drawing.Point(20,40)
+$txtSiteUrl.Size = New-Object System.Drawing.Size(340,20)
+
+$btnSave = New-Object System.Windows.Forms.Button
+$btnSave.Text = "Save"
+$btnSave.Add_Click({
+    Save-Config -SiteUrl $txtSiteUrl.Text -ProductionLibrary "Documents" -TempLibrary "Documents/Temp" -ClientId "" -ClientSecret ""
+    $configForm.Close()
+})
+
+$configForm.Controls.AddRange(@($lblSiteUrl, $txtSiteUrl, $btnSave))
+$configForm.ShowDialog()
diff --git a/MainForm.ps1 b/MainForm.ps1
index 981288e..0fc7f87 100644
--- a/MainForm.ps1
+++ b/MainForm.ps1
@@ -11,6 +11,15 @@ $form.Text = "SharePoint XLS Converter"
 $form.Size = New-Object System.Drawing.Size(600,400)
 
 # Add controls
+$txtSiteUrl = New-Object System.Windows.Forms.TextBox
+$txtSiteUrl.Location = New-Object System.Drawing.Point(20,120)
+$txtSiteUrl.Size = New-Object System.Drawing.Size(200,20)
+
+$btnSaveConfig = New-Object System.Windows.Forms.Button
+$btnSaveConfig.Location = New-Object System.Drawing.Point(230,120)
+$btnSaveConfig.Size = New-Object System.Drawing.Size(80,20)
+$btnSaveConfig.Text = "Save Config"
+
 $btnList = New-Object System.Windows.Forms.Button
 $btnList.Location = New-Object System.Drawing.Point(20,20)
 $btnList.Size = New-Object System.Drawing.Size(120,30)
@@ -35,6 +44,13 @@ $txtStatus.Size = New-Object System.Drawing.Size(540,280)
 $txtStatus.Multiline = $true
 $txtStatus.ScrollBars = "Vertical"
 $form.Controls.Add($txtStatus)
+$form.Controls.Add($txtSiteUrl)
+$form.Controls.Add($btnSaveConfig)
+
+# Load configuration
+if (-not (Load-Config)) {
+    [System.Windows.Forms.MessageBox]::Show("Configuration missing! Please enter settings.")
+}
 
 # Attach event handlers
 $btnList.Add_Click({ List-XlsFiles })
diff --git a/SharePointFunctions.ps1 b/SharePointFunctions.ps1
index 71468ca..0b8ccff 100644
--- a/SharePointFunctions.ps1
+++ b/SharePointFunctions.ps1
@@ -1,7 +1,43 @@
+$configPath = Join-Path $PSScriptRoot "config.json"
+
+function Load-Config {
+    if (Test-Path $configPath) {
+        try {
+            $script:config = Get-Content $configPath | ConvertFrom-Json
+            $script:txtSiteUrl.Text = $config.SiteUrl
+            return $true
+        }
+        catch {
+            Write-Error "Invalid config file: $_"
+            return $false
+        }
+    }
+    return $false
+}
+
+function Save-Config {
+    param(
+        [string]$SiteUrl,
+        [string]$ProductionLibrary,
+        [string]$TempLibrary,
+        [string]$ClientId,
+        [string]$ClientSecret
+    )
+    
+    $config = @{
+        SiteUrl = $SiteUrl
+        ProductionLibrary = $ProductionLibrary
+        TempLibrary = $TempLibrary
+        ClientId = $ClientId
+        ClientSecret = $ClientSecret
+    }
+    
+    $config | ConvertTo-Json | Set-Content $configPath
+}
+
 function Connect-SharePoint {
-    param($SiteUrl)
     try {
-        Connect-PnPOnline -Url $SiteUrl -UseWebLogin
+        Connect-PnPOnline -Url $config.SiteUrl -ClientId $config.ClientId -ClientSecret $config.ClientSecret
         return $true
     }
     catch {
@@ -11,14 +47,14 @@ function Connect-SharePoint {
 }
 
 function List-XlsFiles {
-    if (-not (Connect-SharePoint -SiteUrl "https://yoursite.sharepoint.com")) {
+    if (-not (Connect-SharePoint)) {
         return
     }
     
-    $tempLibrary = "Documents/Temp"
+    $tempLibrary = $config.TempLibrary
     $fileList = @()
     
-    $items = Get-PnPListItem -List "Documents" -PageSize 2000 | Where {
+    $items = Get-PnPListItem -List $config.ProductionLibrary -PageSize 2000 | Where {
         ($_.FieldValues.FileRef -like "*.xls") -and (-not $_.FieldValues.FileRef.Contains(".xlsx"))
     }
     
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..de0afac
--- /dev/null
+++ b/config.json
@@ -0,0 +1,7 @@
+{
+    "SiteUrl": "https://yoursite.sharepoint.com/sites/yoursite",
+    "ProductionLibrary": "Documents",
+    "TempLibrary": "Documents/Temp",
+    "ClientId": "your-client-id",
+    "ClientSecret": "your-client-secret"
+}