First, bear in mind most affiliates would join your program by clicking the sign-up link you'd post to your own Web site, so they wouldn't need to search our Marketplace to find and join your program; you can get your sign-up link code from your Seller Admin > Affiliate Program Settings screen.
To list your affiliate program in the E-junkie Marketplace where existing affiliates of other programs in E-junkie's system could search for and find it on our site, you would need to have "List affiliate program in E-junkie Marketplace" enabled in your Seller Admin > Affiliate Program Settings screen, and add listings to your E-junkie Shop for your products, as explained here:
http://www.e-junkie.com/ej/help.promote.htm