Before advocating a prospective developer, you should check that they satisfy all things listed on the NM checklist.
You should only advocate someone if you think that they are ready to be a developer. This means that you should have known them for some time and can judge their work. It is important that prospective developers have been working in the project for some time, by maintaining a package, helping users and sending patches. They should be familiar with Debian's special ways of doing things and have contributed some work to the project. Just ask yourself if you want to see them in Debian – if you think they should be a Debian developer then go ahead and recommend them.
Next carry out the following steps: Agree with the prospective developer
to recommend them and let them sign
up. After that, you have to click on their name in the listing of Applicants
and go the Advocate this application
page. Enter your debian login
and press the Advocate
button. You then will receive an e-mail with an
auth key which you have to return PGP/GPG signed. After this, the
Applicant is added to the queue for an Application Manager with whom
he will go through all steps of the New Maintainer checks.