Deductions & credits

Thanks for your  help Dave

Could you please clarify:

 

When I arrive on the summary page I  found the $3,000 (I had entered on the previous page with the description "for personal items sold on ebay" )

 

So do I then enter a second item $ -3000 with the slightly modified description "personal items sold thru ebay.  This is not a business"  Will the 0  total then be entered on my 1040 and if so what line?

Thanks again for helping me so I can finally file!!