When you boot the computer up it should show a screen with your cpu ram and other stuff.
On that screen you hit a key (usually F1, F8, F12 or DEL) and it should take you to bios. Be careful since you can damage your computer by changing settings, so make sure you only change WAKE on LAN/ (Ring).
Also it should say somewhere "Press (key) to enter BIOS setup" or something like that.