Changing Instagram email is easy in both ways with login in and without login. If you can enter the account, go to the profile, and change the email. If you cannot open the account, you should use the forgotten password option on Instagram. This way you have the option for Instagram change email without any hassle. For other details on your profile, you can change or update them by clicking on the edit profile option on your profile and then enter your details and then save the changes.