Often, a subscriber may not have a name or email tied to their profile. If they respond with their name in an inbox message, you can quickly add it to their subscriber profile by clicking the ⋮ icon to the right of the subscriber's number > Click Edit subscriber.
You can add a first name, last name, and email. You can't directly edit the phone number as this is what identifies the subscriber in Clearstream. If you need to edit their number, simply opt out the current subscriber and add them as a new subscriber with the updated phone number.