Trying to fix incorrect entry - Form 8829

Hello,

 

Regarding 2019 - while going through the review, I noticed that I entered an incorrect amount for land value instead of the fair market value. Is there a way I can update the amount I incorrectly entered? The incorrect amount I entered is resulting in a negative amount on Form 8829, line 39.  I cannot seem to find to where the TT software asked the questions regarding the fair market value, building value, etc. Just wanted to ask before I delete the entire form and start over.  Note, I have not filed this yet.

 

Thanks in advance!