For editing the scheduled programs, use TASK SCHEDULER. But since that has some 100 scheduled tasks, use EVENT VIEWER first to find out what happened when it woke up. That's necessary to find what task is was, if it was one, which of course isn't sure at all. It can very well be something else.
Use google to find out how to start them and what they do.
To edit the BIOS press the magic key early in the boot process. What that magic key is (escape, del, F2, and more) read the user manual or look if some message like "Press del to enter setup" on the screen. Then find the wake settings, set them as you want, and exit. If unsure, choose "exit without saving" and you won't damage anything.