Now you can use Facebook to login into 4Gram. We will use Facebook Access Token to authenticate your account. If you are still unfamiliar with Facebook Access Token and dont know how to get it, i suggest you to watch this tutorial CLICK HERE.
To able using this login method, you MUST already linked your facebook account with your instagram Account, if you dont know how to link it, see this tutorial CLICK HERE
Copy URL below then open in on new tab to get the token.