Alexa app is required to setup echo or to control home devices by your voice command. Firstly, you have to download Alexa app from Alexa.amazon.com​ or Google play store. How to set up Alexa? To Alexa setup, install Alexa app in your device and Alexa login by adding your id or password. Connect Echo to wifi and move to do Amazon echo dot setup.
https://www.smartspeakerappsetup.com/alexa-setup
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