You have the ability to flag submissions that are off-topic and downvote postings that are off-topic as defined by the HN guidelines linked at the bottom of the

You have the ability to flag submissions that are off-topic and downvote postings that are off-topic as defined by the HN guidelines linked at the bottom of the page. Use them (in a non-partisan, fair way) to help shape HN into the HN you want to see.