Change Incoming Mail Sound

I just updated to V9.01755. It changed the new mail sound to something awful. I found the settings/notification page but it doesn’t tell how to change the sound. I have a MacBook Air. Thanks for your help.

Click on the icon next to the sound file location:

Thanks for your answer Gary. I tried that before I submitted my question but there isn’t anywhere to change the sound. It could just be me not seeing where to go from there. If you have any other suggestions I’d appreciate it. Thanks