There are a lot of options, but I think the fastest one and one of the more versatile is just to download Airdroid and follow the easy instructions.
Maybe I am blind, but I do not see that anywhere.You can download Android File Transfer application for your Mac from this site (Android Central). After installing it on your Mac, connect your S4 via USB cable and just drag and drop files to transfer back and forth from phone to Mac. Very easy and of all the methods I have used this works best for me.
Maybe I am blind, but I do not see that anywhere.