Before following the instructions below, make sure that you have the Alexa app installed and set up on your Device as well as a Radio Station App.
Open Your Radio Station App and click on Settings (bottom right)
Click Link account with Alexa
This will take you to your Alexa App and you should see this screen:
Here, Click on the "Link" button, you will be directed to the following page:
Once you click on "Link Account", a block asking you to link your Planet Radio account to your Alexa will appear:
Click on "Link Account with Alexa", this will open the next page where you can enter your Planet Radio Credentials, if your account already authorises Alexa as an external App, you will be automatically directed to the second picture below:
Here, simply click on "Link your Amazon Account Now" which will a web page on Amazon asking you to Allow your "Sign-in"
Click on "Allow" and you will be redirected to the last page you were seeing but this time a notification will show up on your screen, you should receive a push notification on your device as well:
Your Rayo account is now linked to your Alexa.