Hello @btgrafix,
To advertise your Gigs, it's here: My Fiverr Gigs.
Gigs rankings are based on a wide range of factors: number of orders, customer satisfaction, click-through rates (CTR) , and so on. Even if sharing them on the forum creates a backlink, I'm not sure it has even the slightest effect on your ranking.
More informations here: Ranking Your Gig: A Simple Guide.