Once you have added a client user, you can edit this and other users for that client by navigating back to the "Client Organization" Page. Scroll down to the "Client User" section of the page and click on the name of the user whom you want to edit. The "Client User" Page will load and you will be able to edit all of the client user fields after clicking the Edit button. You can also directly access the "Edit Client User" screen by selecting the checkbox next to the user's name in the "Client User" list on the "Client Organization" Page and then clicking the Edit button above the list. Click the "Save" button when you have finished.

You can also export the user's contact information to a "Vcard" file by clicking the Export button and then clicking "Save" on the resulting dialog box.