Set up git: http://help.github.com/set-up-git-redirect
git config --global user.name "Full Name"
git config --global user.email user@email.com

mkdir spoj
cd spoj
git init
touch README
git add README
git commit -m 'first commit'
git remote add origin git@github.com:silveira/playground.git
git push -u origin master

cd existing_git_repo
git remote add origin git@github.com:silveira/playground.git
git push -u origin master

Click here: https://github.com/silveira/playground/imports/new

Continue: https://github.com/silveira/spoj