Follow these steps to edit a project user:
Step 1:
Select Users from Settings.

How to edit a user account

You will now see the existing users, as well as their profiles and email addresses.

How to edit a user account

Step 2:
Click on the pencil icon.

How to edit a user account

Step 3:
You have the option to modify the user data.

How to edit a user account

Once you have modified the user data, click on Save.