Step 6: Double click on the new "Upperfilters" value you just made. In the "Value Data" box, type "mouclass" and save. You might have a pop-up say something along the lines of "we can't register blank lines" but you can just ignore it. I don't know if the system is cap sensitive, but just in case I used the exact capitalization used in the reddit post. Capital U for Upperfilters, and all low caps for mouclass.