how to remove an amount I entered on line 23200 (other deductions)? I entered an amount in error. It should be 0. Thanks

If you manually entered an amount in Other Deductions, then you can search for Other Deductions on the Tax Home page. 

If the amount was put on Line 23200 - Other Deductions by a form or page in TurboTax, you would have to go back and change your entry there.