Simpla, AdSense Deluxe, single.php

Hi.

I’ve just installed simpla at jurgenfauth.com and like it a lot. I’m looking to add Adsense to individual posts, but not on the home page. I’ve successfully done this with other themes, but simpla is so simple that it doesn’t even have a single.php file. Whatever I add to index.php appears everywhere.

So the question is–how do I get the ads to only show on the individual posts? How does simpla know whether a page is a single post or the home page? Do I need to add a single.php of my own?

I realize this is probably fairly basic but I’m stumped nonetheless. Your help is much appreciated.