Follow these steps to use the new raid tool:

1)  Register at the top right by clicking on register.  Highly recommended that you use the same user/pass that you have on the forums so you don't have to remember something else.

2) Log in by clicking login at the top right.  You don't need to activate your account or anything.

3)  Mouseover Create at the top, and click on Character.  Put in the info for your raiding character and hit submit.

4) Go back to the main page by clicking the Home button.  You can now sign up for raids by clicking on the pencil icon next to the raid icons. You can also sign up by clicking the raid icon and clicking the pencil icon under Status.  You can edit your comments from this page as well, by clicking the n/a under your signup.

That's it.  If you have any questions let me know.