Selling a Collection of Fossils and 1099 K

I followed the instructions given by Turbo Tax for selling a Sports Card Collection and receiving a 1099 K.

was able to get as far as to enter the description 1099 K  Personal Property Sales and to enter the full amount of the 1099 K.  But that's it.

The instructions then continue with: Next, enter an adjustment to reflect the cost of these items as an offsetting, negative amount up to the amount of the income.

For the cost description include Form 1099 K  and Cost of Personal Property 

 

I am unable to enter an adjustment for the cost of personal property.