Nigel_VS,
I am not sure I understand what is the current issue. If you have installed MySQL, to connect to your databse, you need to use the relevant JDBC driver and you can use the Database driver wizard to setup driver using pre-installed driver templates. I would recommend you go through the tutorials here – http://www.myeclipseide.com/module-htmlpages-display-pid-7.html Please go through the section *Databases*
You haven’t mentioned what is the MyEclipse profile you are on also your installation details. To install a plugin, you can use – Help > Software Updates > Add/Remove Software for ME 8.0 and earlier, in case you are using ME 8.5, click on Help > MyEclipse Configuration Center. Select software tab, search for the plugin and follow the wizard. In case you have a plugin, you can copy the same to [your myeclipse installation dir]/dropins/plugins and restart your IDE. Alternatively, you can also use pulse to install plugins.