After going to the link posted above, you have to pay btc to the wallet address you can see provided in the page after clicking the link they provide. Don't forget to check the wallet address you will see, any small mistake will have to be done again and lose a portion of your btc or money. Note: Carefully check what you doing step by step until you successfully bought copper membership.
Copper - 0.00208333 BTC: Allows you to post images even if you are a newbie, reduces the time-between-actions limit, and provides some of the same benefits as being of natural Member rank.