Yeah. Just hit "My Settings" at the top of the page, go under "My Account" and to "General Settings," it should be the first option.
If you mean a way to stay hidden so you can be online without the forum showing that you're online, then yeah. Click on settings in the top right, then on "General Settings" on the left. Invisible mode should be the first option. Just make sure you save your settings. EDIT: Damn it, Misty, I know you saw me posting B|