I recently upgraded my internet and I want to turn my Archer A6 into a wifi adapter, is it possible?

I look for guide and I have attempted to change the Archer A6 into access point mode, then connect the ethernet cable from the main router into the Archer A6 Wan point but it doesn't do anything.

In short, what I want to do is connect Archer A6 wirelessly to my xfinity modem/router and I run ethernet cable from Archer A6 to my pc.