At your box:
make a directory for yor ppnm repository,
mkdir -p ~/repos/ppnm
go to your directory,
cd ~/repos/ppnm
clone your (empty) repository at the server to this directory,
git clone address-of-your-repository ./
if you use git, or
hg clone address-of-your-repository ./
if you use mercury.
Move your exercises to this directory,
mv old-path-to-exercises/* ./
add files to your repository, commit changes, and push to the server,
git add --all
git commit --all -m 'Initial commit'
git push
or, if mercurial,
hg add
hg commit -m 'Initial commit'
hg push