Plugins & comments in a theme

I purchased a theme – when I installed and activated the SexyBookmarks plugin to show in the footer of a post the theme doesn’t display the plugin. I also don’t have any comments. What do I have to do in order to show these?

FYI – The only widget areas I have are:

• Main Widget Area (which I dont see it displays anywhere)
  Home Widget Area (sidebar on the right)
  Support Widget Area (on the support page)
  Footer Widget (footer for all pages)