When getting started with Tiller for Excel, after you've installed the add-in, you'll need to sign in to it from within an Excel workbook using the Google account that's associated with your Tiller subscription.
You also need to sign in again if your already linked workbook has been closed for a while.
How to sign in to the Excel add-in
Open the Data ribbon in Excel
Click the blue "Open Tiller" button
Click "Sign in to Tiller"
Authenticate with the Google Account you use for Tiller.
Note: we do not support Microsoft Live authentication for Tiller subscriptions at this time, but we are currently building this support. If you'd prefer a Microsoft Live login option, complete this form.