Home Internet and wifi extender

I have been trying for 6 weeks to set up my Netgear AC1750/6250 mesh extender with my T-Mobile gateway and finally found the way to do it since the T-Mobile gateway doesn't have a WPS button. I connected the extender to my PC with an ethernet cable, used 192.168.1.250  to locate the Netgear account, logged in, then went through the steps to set up extender.  It is now working!! I'm sure that all of the other manufacturers have a similar login to set up extenders.  

Hope this helps :-)