You have to finish the process of becoming a full member first. Here's how to do the Tags:
You may want to add some tags on your page indicating a family name for one tag and a specific location like a country, state etc you are interested in, for another tag and then add other surnames or locations as tags as desired. That way you will be connected to others with the same interest.
Click on http://www.wikitree.com/wiki/Special:Following to add or remove tags. Be sure to add comments explaining why you're following the tags. Those appear on your profile too.
Then click on Volunteer botton..
Volunteer and sign the Honor Code
After creating a Guest Membership you'll want to read our Honor Code. This Honor Code is a promise that members make to each other. It's the foundation of our community.
If you need help using Wiki Tree, If your not sure how to use WikiTree check out this page: http://www.wikitree.com/wiki/How_to_use_WikiTree
Also a YouTube video going step by step that may help. https://www.youtube.com/watch?v=BFFv2jhzXxA
This one is their newest YouTube video with an introduction and "how to" use the WikiTree website. Its about 34 minutes with slides to point out key points. https://www.youtube.com/watch?v=KTgOdAhSsVg (After the intro chat the teaching starts and slides to show you what was being done).