sidebar twitter widget also shows up at bottom of page

Hi,
Originally, I had the twitter widget at the bottom of the page. I did this via the blue and white customize page. Then I decided to move the twitter widget to the sidebar on my twenty-ten theme page (melissabanczak.com). I added it and it worked just fine. Then I remembered that I still had it at the bottom. So, I went back to the blue and white customize page and removed it from the widget list. This made it disappear from the sidebar as well. I don’t want or need it in both places. How do I get rid of the one on the bottom and keep the sidebar?
Melissa