Right now, it's not possible to pin a card to a certain position. All cards can always be moved around by all members on the board.
If you'd like to share information on the board you might want to checkout the readme Power-Up to share these kind of information with users: https://trello.com/power-ups/5a2de0c41ae4a1537bb0055d/read-me
@K B Tidwell Here are 2 Trellinator commands that will snap a card back into position when it's moved, and unarchive it when archived, if it has the label "Snap":
You can see how to install Trellinator here:
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