Line 18 of schedule C . 2021 TurboTax

Where in the step by step, I enter expenses on schedule C line 18 ? I entered business expenses page, from Advertisement... to Utilities.  None of this 21 items corresponding to line 18.  I try to enter Art drawing supply.  Maybe I should not enter as Office expense on line 18.  Should it be entered on line 22, Supplies?