The Launch URL indicates the web address of the External Tool, and may contain additional information, such as the resource to show.
If you are unsure what to enter for the Launch URL, please check with the tool provider for more information.

If you have selected a specific tool type, you may not need to enter a Launch URL. If the tool link is used to just launch
into the tool provider's system, and not go to a specific resource, this will likely be the case.