For cards use the card link function ( the C1 and C2 next to LINK in the bar above where you're typing right now).
For C1, you highlight a card number you type and hit C1. So if I type n002 and then highlight it and hit C1, I get
For C2, you can write Anything and then highlight that and type in the card number in the pop up box. So if I highlight Sasuke I Think and type n002 in the pop up box, I get