No problem, this is very easy to fix!
1. Head to this page and verify that the wrong Instagram account is connected.
2. Select "Disconnect" (this will immediately disconnect the incorrect account).
3. Check which account you are logged into on your web browser by opening a new tab. You must be connected to the Instagram account that you want to be connected to Ampjar.
4. Back on the connections page select "Connect" next to Instagram and you'll be able to log in to your chosen Instagram account.