How to configure remote routeros proxy cache

Sounds rather basic but well…

I have an RB1000 with user manager and web proxy.

I also have an RB600 and RB433 as APs each with public IPs.

All three routerboards are connected to the same switch/hub.

I am trying to ensure that clients connected to the APs are authenticated via user manager on RB1000 (i’ve already accomplished this) and http requests are redirected transparently to the proxy cache on RB1000.

How do i configure the APs and the RB1000?

Anybody?