WikiTree is not connected to ancestry.com and you will not automatically see a family tree here when you log in.
You are still a Guest member here and need to finish your registration. You should create your research tags and click the Volunteer button. A Greeter will then confirm you as a Family Member and you can begin to add your family to WikiTree. Once you have added enough members to connect to the main tree, you will see more generations of your family line.