Once a User has been invited and has created his account, you can edit the User details anytime.
The details of the User that you can edit include:
To edit User Details and Information, follow these steps.
Navigate to Users (Manage > Users)
Hover the mouse over to the User you'd like to edit details for and click on the Edit button.
In the pop up Edit User, you get the respective fields to edit - Name, Email Address, Mobile Number, External ID, Designation and Role. Make the changes you'd like to do and click on Update button to save the changes.