In order to broadcast, you will need to create an account on the free Blast Radio mobile app (get it here). After downloading, create your station by picking a username and verifying your email address.
When launching the Desktop Broadcasting App for the first time, you will be prompted to enter your username or email. After doing so, you will receive an authorization code in your email. Enter that code in the Desktop Broadcasting App to log in and start broadcasting.
If you didn’t receive an authorization code in your email, send a note to email@example.com.