Launch the app on your iPhone/iPod Touch and you should be able to see your server on the servers list, connect to it. Once successfully connected you should be able to see the shooting screen with buttons for controlling various camera settings and a preview area for the image.
The settings options available on this shooting screen depend on the mode in which your camera is set. Remember that selecting the mode of shooting has to be done manually on the camera and cannot be controlled from the dSLR Remote. If your camera supports live view you can use your iPhone/iPod Touch to preview your shot and compose your image easily. Depending on the mode selected, several settings are available including white balance, exposure compensation, image quality (JPEG/RAW), ISO settings, etc.