As any app for Confluence Cloud, you can install the app via the Confluence admin menu.
Log into your Confluence instance as an admin.
Click on “Apps > Manage apps” in the header menu.
Click on “Find new apps” on the right navigation.
Search for “tldraw Sketches and Scribbles for Confluence” and select it.
Click on “Try it free” to install the app.
tldraw Sketches and Scribbles for Confluence provides a macro that allows you to add a whiteboard to any Confluence page. The macro can be added by clicking the “Insert” / “+” Button in the edit mode and selecting "tldraw Board (read-only)". To change the whiteboard content, just open the macro’s edit dialog: