Hi, gk1! I realize it's not very clear right now (sorry about that). Currently a small number of people have access to post and comment to:

(1) control the quality of submissions (if everyone had access it would be all self-promotion and

(2) reduce the number of products posted (with its current design, the feed wouldn't scale if 100+ products were submitted each day)

Please add your name here if you're interested and we'll drop you a note once it's opened up further: http://bit.ly/ph-contributor