MySQL

hi experts,

im new in web developing and i installed a plugin in my Joomla site. i messed it up and i wanna to remove it manually. i got the information how to do it from the developer, but im totally lost in MySQL commands. The original text said:
"   Delete the component and plug-in entry from database.
    Execute the following query.
         1. DELETE FROM databasePrefix_components where option = ‘com_jsecure’
         2. DELETE FROM databasePrefix_plugins where element = ‘jsecure’    "

I open on the cpanel PhPmyadim, the window for typing the command is there, but i have no idea what to type.  Any help in this matter will be highly appreciated.

Thank you in advance.

Regards,
Raul