Start by Download Alexa App and Install Alexa App on your mobile device - there is a version of Alexa for the iPhone and Alexa for Android. You may not use this app often, but it's essential for the initial setup.
Plug in your Amazon Echo. Wait a few seconds for the ring at the top of the device to turn orange. This indicates it's ready to be set up.
Open the Alexa app on your mobile device and tap the three horizontal lines in the upper right corner of the screen.
Tap "Add Device."
On the Setup screen, tap "Amazon Echo."
Tap the kind of Echo device you are setting up - Echo, Echo Dot, Echo, and so on.