The meaning of signpost in dream | Dream Interpretation
Vision: Seeing a blank signpost on a house or door: you are facing a confusing situation—try to find a solution or alternate route. Somebody handing you a signpost means pay attention—someone is attacking you and you need to respond quickly. Seeing a sign above a door of a shop: friends are envious of your success and you are right to be annoyed.
Depth Psychology: A sign with instructions on it is a challenge to express more of your personality.
Good advice will be given you; do not ignore it.