This was great... thanks a lot "Andrew".
These directions work ONLY if you register your ssh key with your github.com account and not your git.ligo.org account. You'll have to generate TWO ssh keys on a single compypyie, and put one key on your github.com account and another on your git.ligo.org account.
I have done this for my git accounts on acromag1 and 2, so now we can git clone via ssh from both git.ligo.org and github.com. V convenient.