How can I set up an Ad on craiglist?

[Ultimate]

I want to advertise Graphic Design jobs on craigslist, but I don't know anything about craigslist what section and how could I set this up?

[Carlos]

First you need to open an account. It asks for your email when signing up. Since I post regularly, I have about 10 email accounts setup just for this. Reason is that you can only post about every three days. But, you can post everyday using the different emails, along with a different phone number for each.
As for the section, if it is a job you are offering, you can choose ART/Media/Design, Web/ info design. Or if you are providing your graphic design services, then go to the Services section. There you can post on the Creative, Computer, Small Business Ads. I usually post on all these for a better response. Just don't over post, as your ads might get flagged.