You'd have to find where you entered it originally and delete the amount from there. Then you can enter it as Line 10400 – Other employment income.
If you are using TurboTax Online, you can search for tips on the Tax Home page.
If you are using TurboTax Desktop in EasyStep mode, you can search for tips using the Find tool.
If you are using TurboTax Desktop in Forms mode, you can search for the EMPL worksheet by clicking on the Forms icon in the blue icon bar.