High pitched feedback from Mic [SOLVED]

I hired someone to help me get audacity working with the MAC. I’m not sure what he did wrong but the mic emits high screaming sound
when next to computer. We thought it would be ok to stretch mic as far as possible away from computer but my voice is still tinny. There is no red color only green when I record if that makes a difference. Please I need help!

Try clicking on Transport > Software Playthrough (on/off) to turn it off.

If it is already off (not checked) then you have other problems.

– Bill

THAT WORKED!!! THANK YOU!!! THANK YOU!!! I even remembered thats one of the things the guy did!