Log into your account, click your user icon in the upper right-hand corner of the dashboard, then select "Profile".

Alternatively, this may also be accessed through the sidebar via "Settings":

You should start on the Profile page by default, if not, click Profile in the settings page menu. From there, you can update the email address field. Delete the existing email, then enter the new one.

Note: If your profile was previously using our older "username" method to log in, you'll also see a "username" option when editing your account.