You cannot change it now once it has been efiled but more than likely your return will be rejected since the IRS uses AGI information for identity verification. If your return is rejected you will have the opportunity to correct the return. If that happens, to revisit the 2017 AGI section/topic in TurboTax Online, please follow the instructions in the TurboTax FAQ below.
https://ttlc.intuit.com/replies/4168567
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