Add new echo to media player

I am using the media player component. When I set it up I went to commuity > Store and clicked on Alexa Media Player. Then INSTALLED it. As part of the install I defined Included Devices which were the two devices I had at the time. Going into the settings for Media Player do not see any options to edit that list. How do you add another device to the Media Player component?

I too would like to know how to do this.