Thanks for your report. Based on the information you provided, it looks like you're able to log into the email address associated with your account. If your password has been changed or you forgot your password, you can get a link to reset your Instagram password by tapping "Forgot Password" on the Instagram sign in page.
If the email on your account has been changed, please look for any previous emails that we sent you to revert back any changes.
For more information on how to reset your password, please check out the Help Center: