Board members can be added to cards. A person must be a member of a board in order to add them to a card. When a member is added to a card, they will automatically start watching the card.
Card members will receive notifications for the following:
All comments on the card
Adding, changing, and upcoming due dates
Card moves and archives
If a card member chooses not to watch the card at a later point, they will no longer receive these notifications.
Add a member to a card
To add an person to a card from the card back:
Select the card to open it
Choose "Members" from the right side of the card
Type the member's name or click on their avatar
Quick edit menu
You can also add a member to a card by selecting “Change members” from the quick edit menu.
To open the quick edit menu:
Right-click any card on the board, or hover over it and click the pencil () icon
Select “Change members”
Drag and drop members to cards
Drag and drop a member’s avatar from the board header to any card on the board to add them to the card.
Press the following keys while hovering over the card or when the card is open:
SPACE - Add yourself to a card.
a - Add another member to a card.
Once someone is added as a member of a board, they'll be able to see all cards and lists on that board. There isn’t a way to only show someone the cards they’re added to.