No Wifi

Hi, This is my first request.  I am not very knowledgeable and need help because my new CAX30 modem-router has no wifi.

I tried using the app on my phone but failed - I don't really understand what they are saying.

Please help me get wifi working on my devices:  laptop, phone and TV.  My former gateway, CN7000 worked perfectly but someone set it up for me.  

Thank you,

MaryAnn