Hi
I don't have your hardware but until you get a better reply --
1) Can you use this device or not?
2) According to
http://unex.com.tw/product/dnxa-92.....you have model AR8280
it looks like an atheros device but its not clear to me if you need firmware or not as
http://packages.debian.org/wheezy/firmware-atheros has not mention of your model number of ar8280
3) If it does work for you, you might just need a graphical connect manager like wicd-gtk
http://packages.debian.org/wheezy/wicd-gtk
Of course I don't know if you use Debian so those were only examples above, your package manager should have similar names.
In summary
You are likely to have a kernel module called that starts with "ath"
You may have (or need firmware) as well
Once modules and/or firmware is loaded, you would run wicd or wicd-gtk to detect then connect to your router or access point