How do I correctly CLEAR the CMOS?

I need to clear the cmos so that it will remove the Administrator user account password. My husband was the admin user and I have a standard user acct. Which was fine until my husband died and took the password with him. I cannot do anything without needing permissions or his password.

I have taken the battery out for 5 min then 10 & 30 min. Did not work. Thought i took off the jumper pin off and back on correctly, but now i am not sure after reading 2 of your posted answers from others.

There are 3 pins and the jumper go's on. 1 & 2. OR 2 & 3. So which set should it be on when i take it off then restart, wait 10 seconds then turn off again and put jumper on? 2 & 3 ?

When i did it, i was not aware their were 3 jumper pins. I just thought i would take it off, restart, turn off and put back in the same position( thinking it was 2 pins.) Soo i really dont know exactly what position it was on, in the 1st place. Please help. Thx