I have successfully made a radio bumper, but I struggled a lot in the process trying to figure out the different audio softwares and editing the bumper.
In order to make this bumper I used GarageBand instead of Audacity, because I couldn’t figure out how to add external sounds into Audacity. In addition to adding my voice saying “This is Lucy Schraff, and welcome to DS106 Radio”, I also added an ominous bass sound effect to the beginning and the end of the bumper which I downloaded from http://freesound.org.
Here is my bumper:
I hope you enjoy!