problem in rospack find my package..

edit

I am using Indigo version of ROS. I just tried to create a package by reading ros tutorial. I am using rosbuild tool for creating. but i got a problem when executing this command "rospack find ". i am new in ROS, please tried to elaborate more. my terminal output as follow:

root@CHHONKAR:/home/chhonkar/Desktop# roscreate-pkg mypack std_msgs rospy roscpp
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
WARNING: current working directory is not on ROS_PACKAGE_PATH!
Please update your ROS_PACKAGE_PATH environment variable.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Created package directory /home/chhonkar/Desktop/mypack
Created include directory /home/chhonkar/Desktop/mypack/include/mypack
Created cpp source directory /home/chhonkar/Desktop/mypack/src
Created package file /home/chhonkar/Desktop/mypack/Makefile
Created package file /home/chhonkar/Desktop/mypack/manifest.xml
Created package file /home/chhonkar/Desktop/mypack/CMakeLists.txt
Created package file /home/chhonkar/Desktop/mypack/mainpage.dox

Please edit mypack/manifest.xml and mainpage.dox to finish creating your package
root@CHHONKAR:/home/chhonkar/Desktop# rospack profile 
Full tree crawl took 0.018203 seconds.
Directories marked with (*) contain no manifest.  You may
want to delete these directories.
To get just of list of directories without manifests,
re-run the profile with --zombie-only
-------------------------------------------------------------
0.017421   /opt/ros/indigo/share
0.000042 * /opt/ros/indigo/share/man
0.000030 * /opt/ros/indigo/share/doc
0.000007 * /opt/ros/indigo/share/man/man1
0.000005 * /opt/ros/indigo/share/doc/liborocos-kdl
root@CHHONKAR:/home/chhonkar/Desktop# rospack find mypack
[rospack] Error: package 'mypack' not found

please tell me how to update ROS PATH. I already seen the ROS PACKAGE PATH but syntax is not clear to me...