Its kind of annoying that no one has really answered this. I had the same problem.
There was a hiccup with my w9. Once that was resolved I had to step through all of the gig edit pages to the last page and then I was presented with the publish button.
Fiverr needs to spend some money and hire PROFESSIONAL developers instead the ones they have. There are all kinds of quirks with this system that anyone with an ounce of sense would not do.....including making me go through ever page of the gig to edit 1 silly thing or to find the publish button.
