Can i amend our filled jointly to filed separate instead of the injured spouse form?

I was not notified of a tax offsett. The instructions are confusing to me on injured spouse form. He worked in 3 states due to traveling job. And we itemized. I have no idea how to fill out page 2 of

After you file

Sorry no, Once you have filed your tax return as Married Filing Joint (MFJ), you CANNOT amend your filing status after the April 15th deadline.

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