Form 5926 is really an affidavit - you're swearing that the disaster that you claimed on your federal return really happened to you, you're giving the information about the insurance company that reimbursed you for the disaster and the amount of the deductible that you and your spouse together had to pay.
This form shouldn't change your taxes at all. You should have already entered the disaster information into your federal return and received any credit for it that you were entitled to. That should also carry over to the Missouri return and just require this form in order to make the state feel like they've done the right thing here by letting you take the credit.
You only need to mail your state return in the year that you are taking the disaster credit. That's the only year that you have to print and sign this additional form swearing that the disaster really happened to you.
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