I've had people registering but then it either takes a while before they access the forum or they never make it.
When you register there's an activation link you get in an email. Check that email you get when registering (if the traffic is heavy for your mail service the email can take minutes, hours, even days to get to you- more rare but it happens), there's an activation link in it.
You just have to click it, and your account becomes active.
In case some of you register but then never make it... if all else fails, register again.
With a good email provider. Yahoo, Google, Msn and others give good, free service.
Ofan