Hi I think you can do it in two ways, firstly the simplest way is to remove the CMOS battery which is attached to the motherboard. If you remove this battery, all CMOS information (including the BIOS password) will be deleted.
This should not be performed on laptops if you are not experienced working with laptop hardware. Open up the computer case and find the metallic CMOS battery. Once you have located it, make sure to power down the computer, unplug the power cables and any USB devices if they are powered. The computer must not be able to get power from anywhere for this to work. Take out the CMOS battery and wait 10-25 minutes before putting it back in. Then plug everything back in, power up the computer and enter the BIOS again. If everything went well, there should be no more passwords.
The second way is to Reset the BIOS password with a backdoor password
Some BIOS manufacturers implement a backdoor password. The backdoor password is a BIOS password that works, no matter what the user sets the BIOS password to. These passwords are typically used for testing and maintenance. The Dell Manufacturer backdoor password is “Dell”. This BIOS password may simply have the same checksum as the real backdoor BIOS password.
(this is not in any way all my words... problem was researched and solution copied and adapted from other peoples work)