I followed the steps of installing both plug inns into my joomla site. After spending about an hour as I couldn't get the icon to show in my articles I simply went to their site and register to obtain the code which I just placed inside my template HTML. After that, everything works just fine. I wish though I can control which pages the sharethis icon would appear and hopefully developers will help clairify all the existing bugs. Anyways, congrats to a job well done.