You would have to file an amended return in order to add itemized deductions, and you would have to upgrade to Deluxe.
You should wait until you receive the original refund form your first return before you amend. Amended returns are filed on paper by mail and it takes the IRS 6-12 weeks to process them.
Instructions on amending follow:
https://ttlc.intuit.com/replies/5114064
