How to fork and submit an update via pull request

A good description to do that is given in this link

Summary:

• fork this repository into your account
• modify / update or develop further components and codes in a new branch
• submit your modification via a pull request
• I (Atiyah or Edmund) will merge the modified branch to the master
• the older branch will be deleted in this repository
• update your master repository and delete the old branch locally