wn3500rp hard wired

hi first time posting

the above extender is there any way to run cable from my virgin media hb to extender

and configure it to be an acess point , using it as an extender is good but my sons mobile fon loses connection the externder is out side his room if i move into room i lose wifi from router to extender i have loads of ethernet cables going into his room for other stuff i can use. so basically router to extender using cable then wifi to his mobile fone .. thanks for any advice mark