Clients can update some of their account information directly from the SA Manage Service app - the same app they can use to pay their Invoices and view the Services they are receiving. To do this, tap the "More" button in the navigation bar at the bottom of the screen:
This will take you to the Setting page. Tap "Update Additional Information":
On the "Change Information" page, users can update their email, phone numbers, and any Custom Fields that are enabled for them via the Client Portal Settings. Simply tap a field, type in the update, and then tap the blue Save button at the bottom of the page: