If you have no experience opening a laptop, doing it for first time might not be a good idea. See a youtube video how to do it.
https://www.youtube.com/watch?v=MTg8qhWKNpA
https://www.youtube.com/watch?v=cg_wvp1YdSI
Look for inside small battery and disconnect it (not very easy) for a minute.
SOURCE: i need to reset bios administrator password of my hp probook 5310m
If you know the password you can enter the BIOS settings to change the password.. but i stress that you WILL need the current password to do so.
If you do NOT know the current password, you will have to remove the Lithium ION 1.5v battery from the computer, which will require a miniature screw-driver. If you remove the battery for about 30 seconds, the BIOS settings will be cleared to default.
In order to do this I suggest you look up a guide on the manufacturer's website and find out where exactly the battery is housed. It is generally very easy to access the battery, so don't be too scared off by all of the steps provided.
If you are a newer of computer, you can use the bios/cmos password recovery tool from http://www.biospasswordrecovery.com
Wish you luck!
SOURCE: how to reset bios password
You'll need to find out which screws hold the keyboard in. Usually three or four and are on the bottom of the laptop. After unscrewing them you'll have to pry off the plastic part (carefully) that is just under where your laptops screen is. Then you will see two, three, or four screws that hold the keyboard in. Unscrew those, then gently lift up the keyboard and you should see a small round button battery somewhere on the exposed part. That is the CMOS/BIOS battery. (Note you might have to take more screws out on the back if the battery is hidden under a part, but usually it is visible and you can get to it) remove that battery for 1/2 hour or longer, and put it back. This usally will reset the bios and its password. Also note tho, that some newer boards that won't work on, and you'll need to buy software especially for reseting the password in the BIOS. Youtube has some 'videos' that advertise those softwares. Try the battery thing first tho. If uncomfortable doing that first part to get to the battery yourself, you will want someone who knows how to take apart a laptop to do it for you.
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