Users are not able to change their email addresses, but administrators can do it for them.
First, we recommend that you verify the user's new email address by sending them an email and asking them to respond. This ensures that the users's email is accurate and that the user will receive important information such as invoices once the address is updated.
Once you have verified the user's email account, follow these instructions to update their email address:
Go to Users & Groups > Users
Use the filters to find your user
Click on your user's username to bring up their details
Go to the Edit tab
Change the email once you have verified the new address
Hit Save