Hello, You will need to file an amended return to add the 1099 income to it. Since the 1099 is from a job you will need to add a schedule C onto the amended return to report this income and any expenses you have.
Here is an article with information on amended returns
https://turbotax.intuit.com/tax-tips/amend-return/how-to-correct-federal-tax-returns/L67t0F7il
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