How to use Mercurial in side Eclipse Helios (3.6)

Question

I am using Eclipse Helios (3.6). I want to use Mercurial for version management of the program. I have take the help of the below link to find out the plugin but not got any success:

• Mercurial Eclipse Plugin

Can any one please help to install Mercurial plugins inside my Eclipse and I also don't know how to use also. I have gone through the video also but not clear.

• http://www.youtube.com/watch?v=9OBg6Zv0Tns

My question is that I want to use Mercurial in my project for version control. I know what Mercurial is, but don't know how to use it.

I want to know what is the initial setup that I have do if I want to use Mercurial set up in my project.

When I am trying to add new software It is giving me following error.