To remove a plugin entirely from your system, use the uninstaller that comes with the plugin. The plugin will most likely unregister itself with Visual Codec Studio (and any other Codex applications). Just restart Visual Codec Studio to see if the plugin is removed. If not,
To manually remove a plugin:
Click Plugins, then click Remove.
Select the name of the plugin you wish to remove. Note that this will not uninstall the plugin from your system, but remove it from use inside Visual Codec Studio.
Restart Visual Codec Studio for the changes to take effect.