To reset your password using a web browser, follow this link:
If you're already logged into your Instagram account but need to access the login screen to reset your password, follow these steps:
Step 1: Tap your username in the upper left corner, then select add account.

Step 2: Tap log into existing account.

Step 3: Select switch accounts.

Step 4: Tap get help logging in.

Step 5: Enter your username or email address, then tap next.

Step 6: Choose to receive the recovery email or SMS.

You should now receive a recovery email or SMS containing both a login and password reset link.