On the main page of your Boosteroid account, click on your user profile in the upper right corner;

Then, on this page, you can see the “Edit Profile” button in the "My Info" section;

After clicking on this button, you will see an E-mail window where you can enter your new email address. Click on the button “Save Changes” to save the changes;

After that, a "Change Email Confirmation" letter will be sent to your previous email address;

Once you press the "Confirm Email" button in that letter, the email address will be changed successfully.