doesn't know how to do itUsed to say that someone does not know how something works or how to perform an action. The subject changes the verb: ich weiß nicht, wie es geht means “I don't know how to do it.”
GE: Ich möchte das Fahrrad reparieren, aber ich weiß nicht, wie es geht.
EN: I want to repair the bike, but I don't know how to do it.