After looking at it, it doesn't look like you can add wireless to it directly.
What I think you'll need to do is use a network cable to connect it to a wireless access point that's configured to be a wireless bridge from your wireless router.
I don't know what you can do for getting an access point set as a bridge, I think there are devices that exist that you can buy, but I do know a regular router that has DD-WRT installed can be configured to be a glorified wireless bridge. See more about DD-WRT bridge: Wireless Bridge - DD-WRT Wiki

Here's an Amazon search for wireless bridge devices: https://www.amazon.com/s?ie=UTF8&fie...eless%20bridge