If you see a button that says Log in as (your name), tap it to continue. If you see a button that says Log in as (someone else’s name), tap Switch Accounts to open the login screen, then enter your Instagram username.
Use this method if your Instagram account is linked to your Facebook account.
If you see a link with the Facebook logo that says Continue as (your name), tap that instead. If you see a link that says Continue as but displays the wrong name, tap Switch Accounts to return to the login screen, then tap Log in with Facebook.
Use this method if you want to log in to an account other than the one you used last.
Tap the profile icon at the bottom-right corner of the screen. Tap the gear at the top-right corner of the screen. Scroll down and tap Log Out. Tap Log Out to confirm.
If your account is connected to Facebook, tap Log in with Facebook, then type your Facebook username and password into the blanks.
If you signed in with Facebook, tap OK to continue to Instagram.