Database replication using wamp?

I have created a POS system for our corporation, in the HQ we have a wamp server with the main database, we also have more than 25 branches across the country. I will setup a wamp server on each branch, so I can access its database directly when putting wamp online. I want to make MySQL replication with all branches, so every query on any branch will affect the main database on HQ. I tried to test but found no one to explain how to do it using wamp on different PCs.