1040 Schedule C, Line 48. I'm trying to remove my text from old entries, but I can't find a way to do it. What am I missing?

You will not be able to edit directly on the Schedule C, Part V itself to remove or edit the "other expenses" that appear there if they transferred in from your 2016 return or came in from the Schedule C Worksheet.  

The entries you see on Schedule C, Part V that you can't edit come from the Schedule C Worksheet.

While in Forms Mode, look in the left column list of forms, and select the Schedule C Worksheet (may be abbreviated as Schedule C Wks).    On the Worksheet, you can scroll way down to   "Miscellaneous Expenses", and then in that subtopic scroll further down to "Other expenses".   You should be able to edit/delete there on the Worksheet.   Then check the Schedule C, Part V to be sure your changes flowed correctly from the worksheet to the Schedule C.