You have to be plugged into the wireless router with a cat 5 or car 6 cable, then go to network preferences, setup new network, and follow the instructions. Some routers require the disk that came...
(This is for snow leopard (10.6.8) but it might work on other versions.) If you have changed your admin password previously, go to the log in screen, click forgot password, then click reset password....
One password is for administrative access to BIOS settings. The other is optional and is used for unlocking input devices (particularly, the keyboard) on startup.
You cannot decrypt the administrator password in BIOS. What you can do is to reset the BIOS by finding the correct jumper on your motherboard. This should be shown in your motherboard manual. If you...