You want to log into the Asus and turn on the 5Ghz interface, then setup the SSID, channel and security settings to your preference. Then once you have the DAP-1522 plugged into the desired switch or endpoint, log into it, and set it into Client Bridge mode, whereby it should let you select, fill in the password and connect to the 5Ghz broadcoast you just created on the Asus. Done. 5 minutes, tops.
That's the route I recommend most people go if they have at least intermediate networking knowledge, or they're willing to invest time into learning. On a related note, the 1.6 EdgeOS release for the ERL is supposedly going to make *all* options configurable from a tree-like expandable navigation structure in the GUI, kind of like how MikroTik does it with RouterOS. Definitely looking forward to that, as it will make it much easier for non-CLI users to quickly drill down and alter any setting they like.
