First there are two options to select the send and receive. In send you should select the type of cash you are about to pay for exchange and in the below column enter the amount you wish to exchange.
Once entered select the type of cash you want in recieve option and you should see the value converted automatically below.
Then click exchange button to progress to the next step. In the next step you will be asked to enter the email id the respective usd account(ex payeer,perfect money etc).
Clicking exchange will take you to next page where you will asked to click pay.
You will be directed to a page which shows the account no with which you need to make payment and enter the transaction id to start the process of exchange.
The exchange process will be completed within 1hr of entering the transaction id.