In your Impact dashboard, click the Admin link [1]. Then click the Users & Permissions link [2].

In the users tab, you can view all your users, user permissions, feature permissions, and teams.

To edit a user, click the Options menu [1] and click the Edit User link [2].

You can change the name [1] and feature permission settings [2] for the user. You are not able to change the user’s email. To add a new email please follow the directions to invite a new user. 

To save your changes, click the Save User button [3].