What is the URL ofr wrting a guestbook entry?

Hello, when showing the guestbook, there is a button for signing the guestbook.
If I copy the link behind this button and create a seperate menu item with this link it doesn't work. There is an error: "You have to select the guestbook from the menu or reset the menu entry!"

is it not possible to create a menu entry for writing in the guestbook?

Regards, Peter

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