This contributor role as '''Editor''' is designed for polishing and making the beta apps look their best prior to releasing them live.
This is a level of contributor appropriate for those not too familiar technical with packaging apps, but who would still like to contribute by helping improve the ever-important appearance of the apps, how they are described, the logos and screenshots. This is important for apps as they go live.
Once you become an '''Editor''' you should be able to see a menu called "Beta Apps" in the control panel, above the HDA control box, to the right.