To make changes on your profile you may simply follow these steps below:
On your homepage, click your profile image icon located on the bottom-left corner. Select the "Account" button, which will direct you to the settings.
In this page, you can see the email you used, current plan and when is your renewal date if you under a paid plan.
You can also find the option to delete your account from this page. How to delete my account.
Registered email associated with your account cannot be changed.