How do I make an empty Fn key perform a keyboard shortcut?

So, I use Google Docs in Chrome for work 8 hours a day, more specifically the spreadsheet program. I frequently add notes to cells, and have to press SHIFT+Fn+F2 to quickly enter a note. I would like to program one of the empty Fn keys (F5 or F13) to perform the SHIFT+Fn+F2 shortcut. Is this possible? If so, please explain how!

I have Googled for an answer for about half an hour and only find how to create shortcuts for menu items in Chrome through System Pref and since its a web app it won't work.

If it matters I'm using the newest Apple Wired Keyboard with a number pad.

Thanks so much for your help!

Hey there!

Welcome to mac-forums!

I found this thread on another forum for macs which I think could really help you out, I didn't take the time to read the whole thread but I am assuming that you could find some useful information about your issue there: macforums.com

Also there are two other things which could probably help you out:
This NYT article talking about changed F(x) keys on mac: How to Change the Functions of a Mac's F-Keys - NYTimes.com
And this apple support article (probably the least useful of the 3) about doing the same thing: Mac OS X: How to change the behavior of function keys

Good luck and hopefully it works out!
Ljbaumer