If you need to upload a new Plugin to your Server, you need to upload the folder containing the plugin in (<NEWIRED PORTAL FOLDER>/plugins).
Then, you need to access the portal, and go to the Addons section, as shown below:
once you are inside, if you are not able to see the plugin you uploaded, simply click on reload:
if you are still not able to see it, please contact our support team.
Once you see it, make sure the plugin is set to active:
once this is set, you will be able to find the plugin under the "insert" section of the advanced editor: