Using Git through Git Bash terminal window:
After setting up git : http://help.github.com/win-set-up-git/

< for the first time, copy the entire folder to your local directory>
$ git clone git@github.com: tonydevencenzi/KinectedConference.git

<navigate to the right folder which includes the file you are going to push>
$ cd ~/KinectedConference
$ cd KinectSDKandOF

<push the file you want to update>
$ git add testApp.cpp testApp.h grabVideo.h grabVideo.cpp
$ git commit -m ‘what have been changed’

<add remote origion, this is only needed to be done once>
$ git remote add origin git@github.com: tonydevincenzi/KinectedConference.git

<confirm pushing>
$ git push origin master


(Fetch updates)
git fetch
git merge origin/master


merge help:
http://learn.github.com/p/branching.html