[Problem] Adding an item to Store

Hey every1 What sup?

i got littel problem,please help me :wink:

My problem is : i have my own private server and i found download of green sg which i love it , and the problem is : how im adding him to the store in the server? (in price of 0)

please please please help me fast i really really want it :*:

Much Tanks , Gal.

To be honest I don't see what the problem is.
This question is asked over and over, use the search function.