Wages earned while incarcerated are still taxable income, so the paying institution is required to issue a Form W-2. Whether you need to file a tax return depends on the total amount of your income for the year.
See this IRS help tool to determine whether you need to file a return. Even if your income is less than the minimum amount to be required to file, you may want to file to get a refund of any withholding.
Please clarify your question regarding fixing something on your return. If you already filed your return and need to change something, you'd need to file an amended return, after the original is processed. See here for more details.
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