Just follow what Pmalek instructed you on how to buy copper membership. If you have trouble with it then here's an image that I quoted to help you buy copper membership. You will see how much btc you have to pay in order to avail the copper membership. Don't worry if you paid not in exact amount then you can still pay the remaining balance.


After you bought a copper membership and you wanted to wear the copper membershipttitle then here's an image on how to wear it.
 Just visit here again https://bitcointalk.org/index.php?action=credit;promote