Wiki is not available

Hello Moin,
I did not set up anything. This was given after starting Discourse.
Where can I configure that link so I can show it to you?
Because we don’t have a Wiki yet we also don’t have a category.
But we thought about creating a category and naming it Wiki. But I don’t know how to link it to the FAQ / Wiki button.

Apart from that we thought using the integrated FAQ / Wiki area from Discourse would be a better fit than creating a category.