A net operating loss (NOL) occurs when the overall income is below zero. First take a look at your tax return for 2023 to see if your business loss carried to the 1040 and if you had positive income after it reduced your other income. If you do not have a loss in income overall, you may need to seek the help of a professional to be sure you did complete your return correctly.
A Form 1045 is used to amend a return when an net operating loss (NOL) is going to be carried back. It can be complicated which is why I suggested a professional. The IRS Publication 536 provides details and worksheets if necessary in your situation.
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