Configure AR750S-EXT in AP mode

Hi, I need documentation to configure router in AP MODE. Can someone help me ? thank you

@Junos
Hi, please refer to the following screenshot operation

I have already tried, but the selection remains on the router

@Junos
If there is a conflict, you cannot set the AP mode. Please refer to the screenshot below. If the apply button is gray, it means that there is a function conflict.