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, make your desired modifications to the "Email" field. Click Save when finished.

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.