If you are talking about the vocabulary deck (or any deck really), it's easy to reverse the cards. Open the card browser, select any card that you want to change, and click the "Cards..." button. In the new window, you can edit the card template or add a new one. There's even a "Flip" button at the bottom.
Anki is very customizable and it's worth the effort to understand how it all works and how you can change it to suit your needs better. It's all described in the Anki manual.