To print your card, go back to the Cart just like you were registering. The button changes from Register to View History, and can be found on the main Feis page (e.g. go to Feiseanna, click on the Name of the Feis)
You'll see a button to print dancer card in the cart if the balance due is zero and competitor numbers have been generated by the Feis organizers.
Let us know if you have any other questions.