If it's your own card, press Claim this card. For someone else's card, like Grandad's, ask the tree admins with Send a message → To your tree admins.
Where to find it
Person page → Claim this card
On a phone: if the card's buttons are tucked away, press ☰ Menu first.
Still stuck? Talk to a real person: send us a message, or email support@mywholefamilytree.com