Income has to be reported on the tax return for the tax year in which you received the income. You are not allowed to stick 2021 income onto a 2022 tax return. If you did not file a 2021 return you can do so by using the CD/download for 2021. Prepare a 2021 return and mail it in.
https://turbotax.intuit.com/personal-taxes/past-years-products/
If you already filed your 2021 return, but just left out the 2021 W-2G, then you need to amend that 2021 return after it has been fully processed in order to add the 2021 W-2G income.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-2021-return/
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