We’re sorry to hear that you plan on leaving us. Please, let us know about your reasons. Hopefully, we will be able to help you solve your problems or will use your feedback to improve the app.
If you really want to uninstall SignatureSatori:
Make sure there are no active recurring payments in the Subscription menu
Go to your admin console in G Suite
Click on Apps
Click on Marketplace Apps
Click on SignatureSatori - Email signature management for Gmail
On the left side of the screen, click on DELETE APP and confirm your choice