I need to know the motherboard model. If you don't know or don't know how to find it do this.
press windows key+r and in the box that appears type: msinfo32 then press enter. In the window that opens find System Model and tell me what it says next to it.
In your BIOS settings under boot there should be something that says boot priority or something similar if USB or CD option is not there see if there is an option to add a new boot option.