What happens if you forget to file a 1099 miscellaneous form? I found it yesterday while cleaning and I forgot to file it. Am I going to get in trouble

That 1099Misc shows income you received.  It was supposed to be included on your tax return.  The IRS receives copies of those documents and your return has to match what is reported to the IRS. So unless you reported that income on your return, you will need to amend to include it.

How do I amend my 2019 TurboTax Online return?

A 1040X cannot be e-filed.  It must be printed and mailed.  It will take about 4 months for the IRS to process an amended return.  It is a good idea to use a mailing service that will track it, like UPS or certified mail, so you will know it was received.

Wait about 3 weeks from mailing and you can check the status of your amended return:

https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-questions

https://ttlc.intuit.com/questions/1908543-do-i-need-to-amend