How does the Export card (card 27) track trade goods and when can its effect be used?

Question

Accepted Answer

Marking pins on the Export card costs trade goods and does not end your turn. Once 10 pins are marked, its first effect can be used between rounds, once, to add a sticker to a land. Later effects unlock further along the track.

Kingdom Legacy: Feudal Kingdom

How does the Export card (card 27) track trade goods and when can its effect be used?