Setting up the messaging

I generated my new phone number. I set up the initial phase to send the link for the mobile app to my devices. I downloaded the app on my I Phone and I Pad. The problem is the pc isnt working right. When I go back in to messaging on my pc, it still asks me to input my mobile number when this has been completed already. Does anyone know how to clear this and get to the next function?

I have cleared my browser, my cache my history, tried different browsers and used incognito but it is still glitched.