It's easy .... You must have a VALID email address .... after choosing a username, password and entering a visual confirmation code you will be emailed an activation key ... CLICK ON THE LINK in that EMAIL then login with the username and password that YOU have selected.
It is quite common for your spam catcher to catch that activation key so if it doesn't show up in a moment or two check your spam or junk folder.
So what are you waiting for? click here to sign up