You may be overthinking this one (it happens). I recommend removing everything on rows 21-25 and reading the instructions again very literally. The example on rows 3-9 will look extremely similar to all of the code following that section, so you can use that as a comparison too. Right now, your code is declaring a new variable and a function as opposed to just "call[ing] the processArg function with an argument of 7 and assign[ing] its return value to the variable being processed."
Chime back in if you're still having trouble.