Illinois requires that you must have your Federal amended return approved and finalized prior to filing the amended Illinois return. Since your return will generate a Federal refund, you will need to wait until that refund is received before filing Illinois amended return. You can select that you will file Illinois later when you go to file the Federal amended return.
Once you are cleared to file your Illinois amended return, you will check the box for Federal change and enter the date of acceptance. Box C will be checked yes since you did do a Federal amendment. You may need to file Illinois by mail since you need to have the Federal finalization - an IRS account transcript of the amendment will serve as the Federal finalization.
See Illinois Amended FAQ for more information
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