You can delete your Instagram authentication for Fotogramme app by following the steps below:

1. Remove your account on Fotogramme.
2. Go to the Instagram site (https://instagram.com/) and login to the site.
3. Click/Tap your account name.
4. Click/Tap “EDIT PROFILE”.
5. If using a mobile browser such as Safari for iOS, select “YOUR ACCOUNT” on the upper left portion of the screen.
6. Tap “Manage Applications” and select “REVOKE ACCESS” for Fotogramme.
   *If you want to get authentication again, please re-login on Fotogramme app.