WSAP ac lite simple Network Extension

Hi,
I have a hopefully very simple question, but unfortunately I can’t deal with it as it’s my first Mikrotik device.

I have a network 192.168.0.x / 24

In this network there is a DHCP server, router, everything is already set up… I also have a normal access point in the network and all my devices connect to this AP.

I just want to use the WSAP ac Lite as an additional access point. I want to connect the Microtik to my existing AP via WLAN. Then I want to use the Microtik as a normal AP. The Microtik should extend my WLAN range.

How do I do that?