Enabling Alexa Skill

To use a Radio Skill, like any other skill, it needs to be enabled - be added to the Skills of a given device.

You can do so by using a voice command: Alexa, enable {invoication name}

or via the Amazon App by finding your Skill by the publication name and clicking [Enable], as presented:

That needs to be done only one time before you use the Skill for the first time.