Hi Amber, go to hiveposh.com and register or link your Twitter and Hive account.
After that, you can share your post or other people's Hive post on Twitter with proper tags and don't forget to include #hive on your tags for the bot to recognize and if you get some likes and interaction on your Tweet, you will earn $POSH tokens.
Additionally, you can check this post for the info on sharing other people's post on Twitter for a chance to earn $HIVE. You can also see samples of tweets there that have been upvoted by OCD curators and will get liquid HIVE after 7 days.