If you know no-one on Wikitree you need to contact a volunteer who will create your account. You can find more information and the list of volunteers on the Community Membership page.
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: