Where do I change the cost basis for repairs/improvements of a rental property we sold? On the first screen after clicking "Edit" under "Sale of Property/Depreciation?"

[KittyM]

You cannot change your basis from what you originally entered at a later date.  Your current or depreciated basis in the property will be the original amount less the depreciation you have claimed on the property in the time since you started renting.  

[karigirl813]

If I cannot change the cost basis, where do I add in expenses we incurred while making repairs & improvements between the last day it was a rental and the day we sold it? We were also paying for utilities and HOA fees during that time.

[KittyM]

You will add those as "costs of the sale".