Hey guys I know exactly how to apply them. PM me (Seller) when he pays, and I will show you how to "gold up" his thread.
Basically after he pays, he needs to send you the link to the thread which he wants "gold-up'd", then you go to that thread, and on top and bottom left of the thread, it shows "Post reply", and "Gold Up" will be next to it. Click that, and confirm it.
You can go to your user cp, to see how many Up's you have left. Which you prolly know that already.
Live Fast, Die Young.