You use the linkset code.
Here it is:
[linkset][/linkset]
And for the card of Kelly and Alissa it is:
[linkset]f1241[/linkset]
And for two of Alissa's cards:
[linkset]f1052[/linkset] [linkset]f0913[/linkset]
The card number (and the card letter) must be between the beginning and ending codes, exactly as shown in my above examples.
Only one card per linkset. The number of linksets is not limited except by total text size. Myself and others have posted dozens at once.
If you do not know the card letter:
new cards are always 'e' such as with Lana Lane or 'f' such as these links to Alissa Foxy.
The 'f' cards have the 'xxx' under the BIG letter S on the card image. This is not true of the 'e' cards.