Adding subscription for replication in sql server
This is the article that helped me with replication.  So the database that you are sending from is your publisher and you'll need to go to replication/local publications and create a new publisher with the databases you want to send.  

You may or may not use a middleman/distributor but the subscriber is where you want the database(s) to end up and you will need to set that up as well.  

https://www.sqlshack.com/sql-server-replication-overview-of-components-and-topography/