Clone the repo

git clone ssh://YOU@gerrit.opnfv.org:29418/releng

make changes

git commit -sv
git review
remote: Resolving deltas: 100% (3/3)
remote: Processing changes: new: 1, refs: 1, done
remote:
remote: New Changes:
remote:   https://gerrit.opnfv.org/gerrit/51
remote:
To ssh://agardner@gerrit.opnfv.org:29418/releng.git
 * [new branch]      HEAD -> refs/publish/master

Follow the link to gerrit https://gerrit.opnfv.org/gerrit/51 in a few moments the verify job will have completed and you will see Verified +1 jenkins-ci in the gerrit ui.

If the changes pass the verify job https://build.opnfv.org/ci/view/builder/job/builder-verify-jjb/ The patch can be submitited by a committer. If you don't know who is a commiter just email a request for submission to opnfv-helpdesk@rt.linuxfoundation.org