Vildara

So Lem the Bard has the power to swap a card of the same type from his hand for one in his discard pile. I can't get it to work and I need my heals!! I click the ability. Then I pick a card and discard it. Then the discard pile opens up. The correct card is lit up. I click it and it enlarges. That's it. How do I get the card into my hand?