ATT Netgear Nighthawk M1 Use on Visible Service

[Bonch]

I have a Netgear Nighthawk M1 that I used when the ATT accounts would let you use them as a tablet.  It is an ATT router that I purchased from Best Buy with an ATT SIM.  I have been using Visible on a cheap phone for internet in my camper and while it works reasonably well most of the time, I would like to use the M1 with the antenna I have for it.

Is there a guide somewhere on how to convert the M1 to be able to use Visible or can someone provide me some guidance on how to do this.

Thanks