How does UserGuiding work?
UserGuiding acts as a product experience layer that lays on top of your web platform product. You'll be able to build Guides, Hotspots, Checklists, and an NPS survey on top of your current UI (User Interface).
All these can be shown live to your users by Inserting a unique container code into your web app. Thus, Installing UserGuiding on your web platform or site requires access to its source code.
When you don't have access to the source code
If you do not own the site and can't access a website or app's source code, the site must at least allow our code to be injected temporarily. More information can be found here if you want to test.
If it is not possible to inject temporarily, the only solution would be the initial one which requires platform ownership.