To add a Codex plugin for use with Visual Codec Studio, first install it on your system like you would any other application. The plugin will most likely register itself for use with Visual Codec Studio (and any other Codex application) after the installation. Just restart Visual Codec Studio to see if there are any new codecs available. If not,
To manually add a plugin:
Install the plugin using the plugins installer.
Click Plugins, then click Add.
Select the plugin which you have just installed. If you do not see the name of the plugin you have just installed, it may not have been installed properly, or it may not be a Codex plugin. Contact your plugin provider for more information.
Restart Visual Codec Studio for the changes to take effect.