Computer
Open your Google Account. You might need to sign in.
Under "Security," select Signing in to Google.
Choose Password. You might need to sign in again.
Enter your new password, then select Change Password.
Android Device (Phone/Tablet)
On your Android phone or tablet, open your device's Settings app Google Google Account.
At the top, tap Security.
Under "Signing in to Google," tap Password. You might need to sign in.
Enter your new password, then tap Change Password.
Apple Device (iPhone/iPad)
On your iPhone or iPad, open the Gmail app . Tap Menu Settings your account Manage your Google Account. If you don't use Gmail, go to myaccount.google.com.
At the top, tap Personal info.
Under "Profile," tap Password.
Enter your new password, then select Change Password.
Information gathered from: https://support.google.com/accounts/answer/41078?co=GENIE.Platform%3DDesktop&hl=en