In order to make changes to a user, you will need to modify your address book. Using this tool, you can edit, add, and delete users inside of the Address Book.
From your 2sms portal, select Modify Address Book (inside the Address Book field). From here, you have the ability to add, edit, or delete (or delete all) entries. To make changes to an existing contact, select the contact and then select Edit or Delete, depending on what you would like to accomplish. If you are editing, you will be prompted with the users current information and can modify as needed.