To use the Token Cards that I have made, first locate your Pics folder.
Assuming you use Magic Workstation:
C:/Program Files/Magic Workstation/Pics/TK> this is the folder location and name you want.

Now that you've gotten that set up or located, note that Token Pictures go in the TK (Tokens) folder, other cardsets have other codes, you can figure that one out.

Back to my cards, assuming you haven't downloaded them, do so now. To use them in Magic Workstation, put them in the TK folder, but that's not all you have to do, you'll also need to change the file name, the way DeviantArt saved it, the name is actually entirely gone, so change each one to the following formula:
"<name on card>.full.jpg"

Then drop the file in the TK folder as specified above and you're set.