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Hi Amal!
You probably have installed the turtlebot_description package via a debian package. Thus, it was installed as sudo and if you want to edit it, you need to use sudo as well.
A better way would be to download the turtlebot_description package as source and copy it into your workspace. Remember to modify your ROS_PACKAGE_PATH in order to use the source install and not the debian package.
Have a look at this wiki entry for more details: http://www.ros.org/wiki/fuerte/Installation/Overlays
Good luck!