>open your browser on the computer or smartphone
>then type this address:- https://home.nest.com
>once you are on the website then sign in with your account
>then go to the settings and select manage account
>after that go to account activity
and from there we can change the password for our nestcam account
and if you forgot your old password, in that case you need to select "forgot password" option from the https://home.nest.com website
and then enter your registered email address and then click on reset password
and then follow the instructions and change your password.
and we can also change your nestcam account password from the nest app:-
we need to follow same steps ,open your nest app then go to settings>manage account
and then change your password from there.