MyQ connection issue

I couldn't get my Liftmaster MyQ unit to work with T-Mobile. I bought the MyQ Chamberlain Smart Garage Control on Amazon for less than $20. Took about 15 minutes to install. It works great!  I share access with my kids so I had to go into each user and check the box and save. 

Sammys wrote:

For all those who are we’re having or are having connecting there my queue hub or garage door opener by chamberlain all you need to do is buy a cheap 2.4 G router that has ethernet input connected to the 5G gateway and it’ll work fine that’s what I did

I've connected my old Arris router to the TMobile gateway. What's the next step? I don't see anything new to connect the MyQ opener.