Zello, a program that is installed on the phone and on the computer and tablet, is an Internet radio. A small description of this program you can read a bit lower on this page.

DESCRIPTION ZELLO. Details about the program you read on the official website of this program. Click on this link, or on the button below.
Zello

But there is a wise saying that "the better to see once than hear seven times" because I give you video with YouTube, the author, I do not know, but thanks to him for this video instructions.