You are able to find your account information by clicking on the Account ID on the top right menu and then clicking My Account from the drop-down menu.
The My Account page is where you will find all of your personal account information. The information you can find on this page includes your name, publisher ID, email address, country, and phone number. On this page, you are able to change your email address, your password, as well as all of your personal information.
Note that you can also have several email addresses linked to the same StartApp account for notification purposes only, simply click Add Email.