you can ask Instagram to reset it, using your email address, phone number or your Facebook to contact you and verify your identity. If you're not sure what email address you used, you can still ...

An email security provider called Vade ... profile has been reviewed and deemed eligible for verification," Vade says. "The Instagram and Facebook logos at the header and footer of the email ...

Instagram writes in its Help Center that the verification process takes place within the app, not over email, and you have to be a public figure, celebrity or a brand to request to be verified.