Okay--you said "accepted" as if the return had not been processed yet. Now you say it has been fully processed. You still cannot mess around with it using online because online is closed. If you want to amend and see what happens when you make a change, use the amend process. Make sure you have saved the original return as a tax file and as a pdf before you amend. If you do not like the result you do not have to file the amended return.
https://ttlc.intuit.com/questions/2566895-what-does-it-mean-to-amend-a-return
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed?...
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