Hmmmm, your site and even card layout looks different to mine.
At the free space between the "Deck 1 / Combo" tab an the money I have an additional tab called "Recycle".
Your cards look also different to mine (the pictures are the same, but the symbols on the cards are at other positions).
So you should try to write a message to the support I think and asked them for the recycle tab... (sorry I couldn't help you).
... the problem that you can't switch the decks (1) and the message (2) I also get ...