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Hello, my name is ***** ***** thank you for your question. I am reviewing it now and will reply again in a moment.
I am only assuming you are speaking of your apple id password ***** you can not remember because you mentioned that you tried to download the google email app. So if this is not the case let me know, but if it is please go to https://iforgot.apple.com/password/verify/appleid and type in your Apple ID and continue. Apple will then provide you with an option to reset your password ***** by email, security questions, text message, etc.
Then once you have the password ***** you can try and sign into the app store to download the gmail app. If it does not work right away, you can try and restart and make sure you are connected to wifi.
If you have any questions along the way, please let me know.
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