You can not simply add W-2 (for your jury duty pay) to your original, accepted return. You will need to amend it.
If you do need to amend your tax return, you should wait to file your amendment until you have received your refund or three weeks from the date of payment of taxes due.
Amend your return:
Log in to your account, and open the tax return you already filed.
Click on the link to amend your return.
From there, the software will walk you through the process of filing the amendment.