DO NOT DIRECTLY EDIT THE DATABASES UNLESS YOU KNOW WHAT YOU ARE DOING!
Look all you want, just don't touch.
...I'm assuming you've already installed LinuxMCE? If that's the case, you already have one option.
To log in, execute:
mysql -u root
To see the databases:
show databases;
To use a database:
use {database name here}
Then you can do SQL from there.
The other option is MySQL Query browser - a graphical interface. To get it:
sudo apt-get install mysql-query-browser
Run it from the KDE desktop or with terminal command"
mysql-query-browser
In both cases, you will probably need to collect some knowledge about how SQL databases work.