All you have to do is go to your User CP. Scroll down to the bottom and you will see "Paid Subscriptions." Click on that, choose which level you like and it takes you to Paypal which, if you don't already have an account, it's free and you can pay for your membership with your debit/credit card or bank account. It's really easy and well worth it!
Hey there man, good questions. As for the icons under user names, particularly Armed Forces or Public Safety, if you scroll all the way down the main page, you will see sections devoted to those. When you click on them, you will see a link in the upper left where you can join the group and receive your badge. As for changing your user name, yes, that is possible, though you have to be a Site Supporter and then you can request a name change with an Admin, myself or BlueJet.
i have a few question if you dont mind helping me out with. First would be i see that alot of you have icons under you username like motm and armed forces, how do you recieve those i know the process for motm but what about the others? and second is it possible to change your username that everyone sees when you post a reply or question?