AC86U issues such as not able to make a repeater etc

Hi all, and bear with me, as first time poster here.

I am in France where we use Orange; it comes with its own combined phone and wifi (Livebox). I run a B&B and want to:

1. Extend wifi with the AC68U
2. Have guestes log in using the Facebox wifi login page

Both of these should be possible, but my AC68U is not playing ball.

I've managed to get in and when I go to Admin there is no Operations tab for me to start setting up a repeater,
BUT this maybe due to the fact I...

AC86U issues such as not able to make a repeater etc