http://q3o3hdjbia2v4hjag567piljrz6gmfwfmxjzaqq4qstmicnmujxp45id.onion/guides/a-beginners-guide-to-monero-xmr
The exchange we will be using in this example is one of the exchange listed in our catalog, which allows for fast, automated exchanges, without any interactions with another person being required. You simply select the currency you wish to sell, enter in the amount, then select the currency you wish to purchase, which in this case will be Monero.