If the community existed prior to the hardfork in March on steem, it will exist in Hive but see that you created it more recently than that so you will have to create it on hive. After the hardfork, the chains have been separated so nothing posted on steem will show on hive anymore

Got it. Just reposted my recent blogs and noticed that not all my up-votes from steemit came with it. I assume that some of those up-voters are not on Hive. I don't remember how I set up the community on steemit and I don't see how to set it up on Hive. Any tips?

Go here and look in the top right-hand corner. Clicking that link should guide you through the process