How do I put the "no sign" over a pic?

[TurboTer]

Basically, I suck with graphics. Here are the pics, I'd like the no sign over this pic. If anyone can help, I'd appreciate it greatly. It is for an anti-Shirley Sherrod Facebook page.

 

[Junior Samples]

Actually she helped them people save their farm, she was just recounting an old story about when she just started many years ago that she didnt like white folk, untill she met that old couple.. now she be lovin all of us white folk

 

[TurboTer]

Actually she helped them people save their farm, she was just recounting an old story about when she just started many years ago that she didnt like white folk, untill she met that old couple.. now she be lovin all of us white folk

So I've heard. I'm gonna delete the group, no more need for the symbol.