We have plans for an OTC trading desk in the near future, but in the meantime you will need to deposit funds from an existing wallet to one of your wallets on the exchange. To do so, open the My Wallets page by selecting the first option from the menu when you click on your account name.
On the left hand side of this screen you will see a list of available currencies. Select the currency that you wish to deposit and click on the + icon next to it. This will expand the list of wallets that you have for this currency.
On the right side of the screen, this opens up some options for the wallets. By clicking on the black icon that represents an arrow pointing into the server, you will open a window with the QR code and alphanumeric string that represent your wallet. You may use either of these codes to transfer from your existing wallet.
Please note that it is important not to attempt to transfer a type of currency into an inappropriate wallet. If, for example, you attempt to transfer ETH into a BTC wallet, the funds will vanish and there will be no way to recover them.