You created this variable called reverseStr and assigned it the string hello. But you are not doing anything with it.
You need to find a way to use that variable in your code later on and return the end result. Also you shouldn’t assign it "hello".
reverseString is the name of the function. Maybe you meant to use the variable called reverseStr here?
You are returning the function instead of the reversed string result.
I would remove this completely because it is not doing anything and doesn’t need to be there.