How to add a second (or third or fourth) Alexa app to your current configuration From http://hitechmom.com/add-second-amazon-alexa-device-home/

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How to add a new Alexa Device to your Alexa app

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Open the Amazon
Alexa App
Go to Settings

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Set up a new device

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Choose which device you
want to set up

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Continue

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Connect to Wi-Fi

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Wait for your Echo to
tell you that it’s ready,
then continue

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Connect your phone to
the Amazon network
and wait for the prompt

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Your Alexa device will soon tell you that it’s
ready to use
All of the settings and skills that you’ve enabled
for the first Alexa will work with this new one as
well.