Sale of Business Property

Under Sale of Business Property I need to modify one of my entries, but when I go to update it takes me to a new entry. I cannot get to the original entries I made. The original numbers show up on form 4797.  I tried deleting form 4797 so I could start over, but it will not delete either. How do I find my original entries or delete the original entries so I can start over again???

Thanks.

Scot