How do I add $$$ to a Gig?
You don’t add money to a gig. You either are selling a gig, or you can purchase a gig.
If you want to add some money to your Fiverr account so you can use it to buy gigs without using credit card or Paypal… well, forget about it as it’s not possible.
This feature has been asked from several sellers/buyers, but it’s not been implemented and probably it won’t to avoid money laundering frauds.