By "Wifi Adapter that was for Desktops" I assume you mean the little once that you plug into one of your desktop's USB ports? how do you plan on using that for a miner that doesn't have a USB port? and even if you somehow managed to connect it, you will still need to deal with the drivers, unless you know so much about these things, I don't think you will be able to do it.
The closest alternative solution would be using Ethernet-to-Wi-Fi Adapter which functions like this:
source is amazon
IOGEAR Ethernet-2-WiFi Universal Wireless Adapter.
In a nutshell this device gives a non-wifi device the wifi-capabilities, pretty much the same as the regular Wifi adapter on your desktop, but this one is Ethernet to Wifi as opposed to USB to wifi, there are many other brands so pick whichever you want, keep in mind that you will still need to use a network cable cat5/cat6, the wire can be pretty short it doesn't matter, if you can't pick the signal, you can extend the cable length, once done make sure you test the quality of the link by pining the miner's IP from a PC connected to the main router using the following command
Allow the ping operation to work for 5-10 minutes and then hit ctrl+c to stop it and get a report of the packet loss, rout-trip time, and all of that, alternatively you can use the miner's network tools to ping the pool directly from the miner, the only issue with that is that the miner is set up to perform a default ping of 3 packets which might not give you a very accurate result.
