You need to check MySQL option into plan. Please follow the below steps:-
1.Login into reseller control panel
2.Login into admin section
3. click on plan name on appeared page
4. Please check MySQL option on appeared page
5. check on "Do not change resource prices."
6 Click on next > set MySQL quota on next page
5. Save the changes.
After that you will be able to see MySQL and PHPMyadmin into your user control panel under Databases menu.