If you can't remember your password, you can reset it using your email address, phone number or Facebook account. If you're not able to reset your password this way, open the Instagram app for additional help.
Resetting your password using your email address, phone number or Facebook account
To reset your password, first open the Instagram app. On the login screen, tap Get help signing in below Log In. From there:
On Android: select Use Username or Email, Send an SMS or Log In with Facebook, then enter your information and follow the on-screen instructions.
On iOS, tap Username or Phone. Enter your email address, username or phone number, then tap Send Login Link.