Yes, Having a problem with my child accessing neighbors wireless at all times of the night.
In that case, I think you should use a parental-control program, so that you can use the wireless when you need it.
If you really insist on BIOS disabling, here's a general walkthrough: (all BIOSs are different, so I won't know how yours will be like)
1. Hit the DELETE key, or F1. Your laptop may say which to key to hit "to enter setup"
2. Go through the menus, and find something like "network", or "LAN".
3. Disable, go back to the main menu, save to the CMOS, and the computer will reboot.