Welcome to the Set Creator. It is currently in very early alpha testing and not available to everyone. Only cards that were permanently saved (Generate Permanent Link when creating) can be used here at the moment. To add Hero Portrait and Hero Powers just add corresponding cards through Add Card menu. Tokens could be added to a card after clicking on the card. To delete cards click Delete Card, then select what you want to delete and click Delete Cards again. To share a set first open Set Settings and make it public.

You need to login to make a set.