Connecting your spreadsheet
Option A: Paste the URL
Copy the URL from your browser when you have the Sheet open, like:
https://docs.google.com/spreadsheets/d/abc123.../editPaste it into the connection field and click "Connect".
Option B: Browse your Drive
Click "Browse your Google Sheets" to see a list of all spreadsheets in your Drive. Click any one to connect it.
Troubleshooting
"Permission denied": Make sure you're signed into the same Google account that owns the Sheet.
"Sheet not found": Double-check the URL is a valid Google Sheets link.
Shared Sheets: You can connect Sheets shared with you, as long as you have at least "Viewer" access.