What else do you want to know?

You rent the graphics card for 30 days after the payment has come through everything will be set-up to your personal preference.

For example,

Lets say you want to rent the 7950 and you want to mine LTC with guiminer on the litecoin pool. When the payment is confirmed I will install guiminer and set it up so that it  mines litecoin with your username on the litecoin pool. The 30 day starts as soon as one share is accepted.