You need to connect your Reddit account on hiveposh.com and then share a link in any community (subreddit) on Reddit - things happen automatically then - the same as it was with Twitter.

Is it just about posting the link?

Yes, it is if you mean sharing a good post in an appropriate subreddit.

Reddit’s algorithm

If high % of subreddit's viewers like your link, the algorithm understands this link is something interesting and keeps showing it to more and more people who subscribed on the subreddit. Generally, what you need to do for that

1. find or write a great article on Hive
2. find a perfect thematically appropriate subreddit that allows sharing links (read rules in the right column of every subreddit)
3. think about the title of your share - usually you can make the title better

That's it.

You can also find subreddits close to your interests and engage there to become "a friend" to the mods.

I believe you also should care how your Reddit account looks - if it's a feed with only links, it's not great - some mods would say "This guy isn't a real Redittor, he only wants to post his links on Reddit".