If you have the project locally, but not versioned with Git:
cd local_project_dir
git init
git remote add origin @@ssh@@
# commit something
git push origin --all
git push origin --tags

If you are switching from another Git hosting provider:
cd local_project_dir
git remote change origin @@ssh@@
git push origin --all
git push origin --tags

If you do not have the project locally, and want to clone it:
git clone @@ssh@@ local_project_dir
cd local_project_dir