1. Launch the Exchange Admin Centre
Click on the start button and then expand Microsoft Exchange Server 2016 and click on Exchange Admin Centre.
2. Enter your credentials
Enter in your username and password and press enter.
3. Servers
Once you have logged in click on Servers on the left hand side.
4. Databases
Click on the + button to add a new Mailbox Database and enter in the location for the .EDB and log directory.