Be very careful when breaking into a filed return when using the ONLINE program ... if you make any permanent changes it will affect what gets forwarded to the next year's program.   Return the tax file to the way it was filed if you do make any changes. 

How do I change from the standard deduction to itemized (or vice-versa)?

https://ttlc.intuit.com/questions/1900142-how-do-i-change-from-the-standard-deduction-to-itemized-or...