How to add breadcrumb?

It is possible, what everyone was trying to say is that there may be an alternative solution different from what you are asking, and they were wondering if you’d be interested in that. That said, it is possible but not out of the box. You’d have to design or create something custom for it. Examples, where something similar has been created, are:

Custom top navigation links - theme - Discourse Meta and Custom Header Links - theme - Discourse Meta

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