Click DB and then click PHPMYADMIN and you will be taken to the phpmyadmin page.
Phpmyadmin url is http://hostname/phpmyadmin. In this example its http://vesta.jpserver.com/phpmyadmin/
Enter database username and password (set up user while creating the database) to gain access.
Once logged in you can see the usual phpmyadmin interface where you can select the database and carry out the required operations.