How do I enter printing and photocopy services expenses? Under which category? I'm a private tutor and I print all my teaching materials outside, I don't have a printer

To enter these expenses in TurboTax Self-Employed open Schedule C  and under expenses select the box Add expenses to this Work scroll down the page and check the radio button for Office Expenses then scroll down to the bottom of the page and select continue.  On the next page Let's enter the office expenses....  input your printing and photocopy expenses in the boxes under Enter Your Office Expenses.  You can use a separate line for each expense.