Made an entry (by mistake) on line 38 of Schedule C. How do I delete the value for line 38?

[yellowpirate]

How can I delete the value entered on line 38 of Schedule C?

[Carl]

Most likely, you are using the COGS section (Cost of Goods Sold). In there you are asked for materials and/or supplies cost. So work through COGS and check the numbers. Change as necessary.