You go to log in to your Instagram and find something's amiss -- you can't login. Whatever the reason you lost access, Instagram has measures in place to both protect your account and help you regain access.

Forgotten Credentials

If you've forgotten the username or password for your Instagram account, initiating the password reset procedure remedies the situation. You can do so through the Instagram app or through the website (see link in Resources). During the process, Instagram sends an email to you with further instructions to reset your password. If you've forgotten your username, it will appear in the email Instagram sends. For a password, follow the steps provided in the email.

Deleted or Disabled Accounts

According to Instagram, there is no way to reactivate or retrieve an account you've deleted. If Instagram has disabled your account for any reason, you cannot get the account back. Instagram warns, "There are no exceptions to this policy."