I file my 24 taxes and put my expenses in the withholding lines. how do I fix that to still get my refund

Do you mean that you e-filed already with a mistake?   Or do you mean you prepared your tax return and made a mistake you need to fix before you e-file?

What expenses are you referring to that you entered as withholding?   Are you self-employed?  Did you enter business expenses?  Did you prepare a Schedule C?