Booting Fedora in rescue mode

I have created a new Fedora live USB with the intention of booting into rescue mode and fixing the bootloader, so that I can dualboot win7 and Fedora 20. However, I do not understand how I am to boot into rescue mode, seeing as the installation boot prompt is not shown as described by the guide , I am taken directly to the installation process. Pressing tab when given the option to run Fedora Live allows me write stuff in a terminalish thingy, but writing linux rescue simply starts the Fedora Live as usual. Some sources claim that I need the DVD, not the LiveUSB. I will try this shortly.