I tried to fix it but I am new to raspberry pi/Linux stuff so I have no idea what I did... Please help
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rm fileToRemove.txt
from the terminal, for example. Make sure you're in the proper directory before typing this or it may delete something undesired. To open a terminal in which you can type that, open the file viewer, navigate to the folder in which the file to delete is found, then pressF4
. You'll be able to type therm fileToRemove.txt
now.