Where do I enter itemized expenses for inherited home which sold, 1099-S? We had to do a lot of mold removal which was very costly. Can I deduct this from gain?

In searching, some answers are to deduct expenses from cost basis; however, I cannot find anywhere to itemize these deductions.  We spent a great deal of money getting the property habitable due to mold/mold removal.  Also would like to deduct expenses for selling property which were not deducted on the 1099-S.  Need help finding how to proceed.