There is the Alexa Skill, which allows you to use Alexa to control devices attached to Homey.
Also
There is the Alexa App, which allows you to use Homey to control your Alexa devices.
Help for the Homey skill can be found here :
https://support.athom.com/hc/en-us/articles/360019927453-How-to-connect-Homey-with-Alexa-Voice
Details and help for the app can be found here or the #Alexa channel on slack.
They are two separate things and need to be setup separately.
