Help! My first go on wireless AP

OK, got a Cambium e410 wireless AP (free to test).

I've connected, light is blue and portal says 'onboarded'.

But where do I go from here?

Sorry, I'm completely new to AP's.

Am I using the AP to connect to the internet or do I still use the wireless router?

Do I use the WiFi from both?

Does the AP have a different SSID to the router?

I know, lots of stupid questions, but I find that the manual doesn't contain a lot of info.