Thanks Nerdygirlom, that was very helpful :) I have managed to add the follow button, you can see how it looks like at evanstang.com. However, can you kindly help me with a couple more questions:
1. Is it possible to change the physical dimensions of the follow button? Currently it is a little too long and the "followers" portion has been cut off.
2. I copied and pasted the twitter button URL, but anything from " onwards (script>!function......) just come out as the raw html codes. Are you able to advise on that?
3. Currently, the text in the follow button is "Follow@Evans_Tang". How do I get rid of the @Evans_Tang portion? I just want the button to show "Follow". I unchecked "Show username" on the Twitter website but the html code still comes out with @Evans_Tang.
Thanks very much!