In Chrome
Locate the 3 vertical dots in the top right
Select Settings
Select Autofill and passwords
Select Google Password Manager
Select Passwords
Select the arrow to the right of the password you want to delete from
You will get a sign on screen to the computer you are on. Enter your password you would use to get onto the current computer
If entered correctly, this screen will appear where you can click the Delete to remove it.
Click on Settings to open that window
Make sure the Offer to save passwords switch is gray. If it is not drag, it to the left.
In Firefox
Locate the 3 horizontal lines in the top right
Select Settings
Select Privacy & Security on the left and scroll down
Select Logins and Passwords in the center uncheck 'Ask to save logins and passwords...'
Click on Saved Logins and remove passwords