Crystal from Trello Support here!
You can attach contacts to a card using the Salesforce Power-up. Once you're on the back of the card, select the "Salesforce" button. From there instead of selecting "cases" choose "Attach contact."
Here's a helpful article with instructions on how to do that: https://help.trello.com/article/1055-using-the-salesforce-power-up
If that's not what you're seeing on your card, please write in to us directly so we can take a closer look: https://trello.com/contact
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