How to make a link to a card: Let's say you want to make a link to card with number "34" (number visible when you hover over the card, with this user style installed). Then all you have to do is type #34 (pound sign + the number) in the description of another card, and it will automatically create a link to the first card. Note: links only work within a same board, and if you use the "#" for a header in a description, it will not be a link. Add any text before it to make it a link.