With Copper Membership, you'll be able to do what this user does. His Activity and Merit are similar to yours, he can wear a signature because of his Copper Membership.

Note: If you keep spamming the way you're doing now, Copper Membership isn't going to stop you from getting banned!
You have 120 Posts and 116 Activity now. After some reports, you now have 87 Posts.
You're going to want to read the Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ.