What are Gemini Air Dongles To-Do's when replacing AT&T HUB

Replacing current AT& T Internet Air HUB. DTV Tech Sppt told me I only had to get the New HUB setup and there is Nothing I need to do to allow the Gemini Air Dongles to work with the new HUB. Initial Install Instructions for Gemini Dongles states you must know the HUB ID & Password, so I don't believe what Tech Sppt told me. Might anyone know the Steps I'll take once I get the new HUB setup per AT&T instructions. Someone had to setup for me originally (too confusing) so I'm hopeful of good suggestions. Many Thanks!