Settings > Communication > Knowledgebase URL
You can link your own wiki for endcustomers or a manual for specific products to sell to the customers under the following path:
Settings > Communication > Knowledgebase URL
Here you can now fill in the URL that you want to make available in the end customer panel. In order for this to be displayed, please mark the checkbox and click on Update. This is displayed for the end customer under the Support tab.

