Add a new Stripe widget from your dashboard.
Select a preset widget from the list, or choose to Build your own widget.
Click Connect with Stripe on the connection panel. You'll now be asked to log into your Stripe account, unless you're already logged in.
Finally, you'll be asked to give Geckoboard permission to access your account.
To connect a different Stripe account to the one you've already connected to Geckoboard, see connect multiple accounts to data sources.