Hi Guys,
This might not be the right place to ask but I want to contribute to some open source project. Can anyone please help me to how to start and where to start?
1) Make the changes.
2) Talk to the people who made the program, to see if they're interested in your changes.
If you have not already found it, why not take a look at the GNU website?
The GNU Operating System
See the link about "Can you contribute ....".
A very simple start: pick the open source software you use most often, register with their bug tracking system, and start testing the newest builds. When something breaks, try to repeat it, and send it in with instructions on how to reproduce, what happens, ...
Over time you might start looking at the code to see why it breaks, or how to improve the documentation.