Step 1 : Login to your cpanel
Step 2 : find database
Step 3 : now you need to create database user
Step 4 : now connect this username with your database
Step 5 : check your database created or not
Step 6 : your database created but you need to import your tables( Simply import your .sql file)
DB_DATABASE= database name which we created
DB_USERNAME= database user name which we created
DB_PASSWORD= database user password which we created