There are three ways to send feedback or ask for help:

- twitter (@feedbunch)

- github issue tracker (github.com/amatriain/feedbunch)

- email (admin@feedbunch.com)

They are indicated in the landing page and in the signup, login and other pages.

I don't understand your question about the HN feed. HN has an RSS feed (https://news.ycombinator.com/rss) which as far as I can tell includes every link posted to the front page, but not necessarily in the same order. Feedbunch does not create this feed, HN does, and I guess only someone from HN could explain what gets added to the feed. Feedbunch just shows whatever is in the feed.