I'm a very new smart phone user (but not new to Android) who recently got the Moto G for my introduction to the technology. I used my existing Google account password so as to have access to the Play Store and I also set up the email app with my Yahoo password. I definitely want a password manager before going further, but after I install one of these apps, how can I protect the already-established passwords? If I must delete the passwords and reinstall them using the password manager, how is this done