In order to begin adding family to WikiTree and collaborate with others, you first need to become a member. You begin by registering and confirming your email address.
Once your email address has been confirmed, you will need to create your research tags and Volunteer. You will go to your Navigation Home Page. On that page, you should find boxes labeled Tag and Comments. In one or more of the boxes labeled Tag type a surname or family location that you are researching. In the box underneath labeled Comment, indicate why it is important to you.
Then scroll down the page to the bar that says "Add Tags and Volunteer." Once you click on that bar, a Greeter will see that you want to join WikiTree and will come by and confirm you as a member. You can then add your family and you will receive a link to the new member tutorials offered by WikiTree.
Hope that helps.