@TheWisdom , do you mean amend ( ONLY when your return has been accepted and processed ) or edit the Schedule-C ( i.e not yet filed) ?
Schedule-C is included in the business section / Tab of the software 9 Home & Business).
Home Office expenses are generally not allowed unless you are self-employed and use the space/ facilities exclusively and all the time. If you are wage earner , it is not allowed any more.
Amended return should wait will IRS and the State has accepted and processed your return ( when you have received your refund or at least three to four weeks have passed from the "accepted" fro processing date.
Does this make sense ? Am I misunderstanding your query ? Is there more specific answer you need ?
