you need to first create the PowerStore database on your Hosts MySQL Server, Then Update the connections/localhost.php file to connect to the hosts MySQL server.
Your host should have a panel that allows you to access the MySQL server, most likely using PHPMyAdmin. using this tool, you need to create the PowerStore database using the database/store.sql file. Your host should also be able to give you the correct settings for connecting to your database, you need to update the connections/localhost.php file to use the correct settings to connect to the database on the hosts mysql server.