Hi Donna, you need to send a private message to one of the volunteers (I'm one them; click here to go to my profile page) for an invitation :)
Hi There,
Just closing out this question. I hope you did become a member of WikiTree, if not I suggest you check us out again! We've come a long way in the last couple of years and are working every day to improve our website and the community. If you're interested you can get started by clicking here:
http://www.wikitree.com/index.php?title=Special:Userlogin&type=signup
Thanks!
Eowyn