If your unsure how to change your Google password just follow this short guide.
First of all open up your favourite web browser and if not already there go to the Google search page. Sign in.... and at the top right of the page click the image (your profile picture) then click the "My Account" link
Now on the next page click the "Sign-in & security" link.
Scroll down the following page until you see the "Password.... Last changed: ...." area, click it.
You will then be asked to enter your old password. Enter your password, another window will be shown where you can enter your new password in the two boxes. Then click "Change Password" easy!!
If you have the send phone alerts feature enabled you will receive a text notification of the change.