Can anyone help please?

I have a BT Dual Band Business router that has a public Guest Wi-Fi wireless network.

I have set up the Omada Controller and adopted my AP. I am unsure how I can check what the AP is extending and where on the controller I can see how much data is being used and from which wireless network.

Can I configure the AP only to extend this public guest wireless network?

If I can, how do I do it and what information do I need?

I am a novice so plain english is appreciated!

Many Thanks in advance

Tania