To reset your password if you're not logged in to Facebook, go to Facebook home page and under the password field click on Forgotten account? and type the email address or phone number associated with your Facebook account.
If you have access to your email address or phone number, you will be able to receive a code to reset your Facebook password by selecting Send code via email or Send code via SMS and then by clicking Continue.
The code will be sent via your selected method and a new window will appear to enter the security code. Enter it and click Continue.
Finally, choose a new password, click Continue, and follow the remaining instructions to save the changes.
Enter your phone number, email address or username to find your account. You will see a list with accounts matching to your profile. Select This Is My Account next to yours and follow the instructions to reset your password.
If your Google email address is linked to your Facebook profile, you can immediately regain access to it and skip the confirmation code process. Just choose the option Use my Gmail account on the Reset Your Password page and log into it.
In the new tab type your new password and click Continue.