To update your email address, go to your account tab at the bottom left corner of your homepage and click on the account icon:

Click "Update Email"

A form will pop-up in your browser to enter your new email address and hit "OK":

You will then be taken to the login screen where you can login with your new email address and original password.
You can watch a video example of the process below:
https://www.loom.com/share/8af68201546c45a28a3738ef0ace5a3b?sid=3212eed4-222f-4b74-b0ca-cb85dd1a24fa