There are two ways to follow a Hubber:
1.On a Hub, you can click on the “Follow (author’s name)” link in the About the Author box on the right.
2.On the Hubber’s profile page, you can click on the “Follow (author’s name)” link, also in the box on the right.
Be careful though, following people indiscriminately can affect your HubScore negatively
There are two ways to follow a topic:
1.On a Topic page, you can click on the “Follow This Topic” link in the box on the upper right side of the page.
2.On the category fan page there is a place to search for topics to join as well as recommended categories you might like. You can also remove yourself from following a topic on this page.
I hope this helps!