when u pull up your page...you see on the upper right, followers, follow...right? it is what it is...its who u follow and who follows you.
At the top of your page, it has things like, profile, find people etc etc. Play w/these things. This is the best advice I can give you.
Go to find people and put in DohertyShannen and u will find the real Shannen. When u pull up her page u will see under her pic it says following/follow...click on & then her name will show up in your following list.
I can tell you just because you r a fan doesnt mean the person will follow u, keep in mind they have 100's 1000's of people bugging them every day, every minute. Twitter calls this tweet bombing..
Go play around..take your time...you'll get the hang of it.
If I can do it, you can too. I hope the above helped a bit.
look for me JIKraus
See you in tweeterville