How to remove an app, website linked to your Instagram account
1. Open the Instagram app on your Android or iOS device.
2. Tap on your profile picture available at the bottom right to go to your page.
3. Tap on the three horizontal line menu available at the top right corner of your profile page.
4. Go to the Settings tap on the Security option.
5. Go to the Apps and Websites tab and tap on the Active button.
6. Next to the app you want to delete, tap the Remove button.