To download the repository, get the git command line from http://git-scm.com/downloads
Run:
git clone https://github.com/aQuigs/DWMR
This will download everything into a DWMR folder
Before being able to submit changes, make a github account and run:
git config --global user.email "your email address"
git config --global user.name "your name"
git add file1 file2 ...
Use wildcards like * for all files
git status
git commit -m 'Description of the changes'
git push
git pull