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$ cd ~/Sites/myapp
$ git remote add origin ssh://myserver.com/var/git/myapp.git
$ git push -u origin master

Snippet from How to get a new remote repository going

The following may be needed if you leave out the -u in the git push argument, though I've not confirmed this.
Also needed to add the following config to the repo in .git/config
[branch "master"]
remote = origin
merge = refs/heads/master

This will allow you to simply do:
git push

instead of having to type this everytime (though you do need to do this on the very first push, but not afterwards):
git push origin master