Hopefully this will help....
But I've got a Satellite 2805-S301, so no guarentees. Anyway there appears to be two options:
1) Go to the Start menu, point to Settings, Control Panel, then double click Toshiba HW Setup. You'll find the password options there and it looks likes the same thing that's in BIOS.
2) For access to BIOS (they call it TSETUP), hold the "ESC" button down while you boot up, you'll be prompted to press the "F!" key. Do so and you get into BIOS.
Hope this helps