How can I assign a card to a person?
To assign a card to a person, click that card and look at Card Details in the popover window on the right. Then click Assignees button in the “Add properties” section of Card Details.
Choose a person from the drop-down list.
Note: In this list, you will see only those people with whom you have shared your board.
If you already have Assignees, adding next ones is even easier. Just click a plus button on the right from the “Assignees” property. Then choose a person you need to add from the drop-down list.
To remove an assigned person from the card, simply click on X on the right of the name of that person.