You can manually edit any user name and email address in Receptive.
If the user was created through the Receptive API, you can change their details with the instructions here.
Just find the user's account page by heading to the "Customers" link on the left-hand navigation.
Select the relevant customer from the list.
Scroll down to see a list of end users and select the user you wish to edit.
Click the "Edit" button.
Click on "Profile" on the right-hand side. Then edit any details as necessary. Click on "Save Changes" to ensure your changes take place.