Note: These instructions were created using Android OS 5.1.1 "Lollipop." There are many different versions of Android. Your device might have a slightly different set of fields.
On the Android device, tap Settings.
Under the Personal heading, tap Accounts.
Tap Account Settings.
Tap the account for which you would like to update the password.
Scroll all the way down and tap on Incoming Settings.
Update your password and tap Done.