How do I remove a CTCSS from a saved channel?

[akilou]

I was messing around with my son's FRS radios and wanted to try to use my Quansheng with his radio set to a 'privacy channel'. It worked! I scanned, hit his PTT button, found the code on the Quansheng, and saved it to memory. Now I want to delete just the CTCSS code. How do I do it?

I looked through the wiki and didn't see anything that indicates how to do this.