No, TurboTax's message is a reminder.
If your 2018 tax return already shows the recharacterization and reports the entire $5223 as a non deductible traditional IRA contribution, there is nothing that needs to be changed on your 2018 tax return.
If that is not the case (that the entire amount withdrawn was considered a non deductible IRA contribution and reported as such on your 2018 tax return) and you do need to amend, you would follow these instructions:
1. Sign in to your Turbo Tax Account
2. Scroll down to Your tax returns and documents and select Amend (change) 2019 return, then Amend using Turbo Tax Online.
3. Select the reason you are amending and Continue
4. Answer the questions about your Federal return, (there may be no changes) then begin amending your State return when it says "Lets get started on your state taxes...."
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