Need help with adsense

I had someone setup a blog site for me using wordpress software and he also implemented adsense onto the blog, but now he’s out of the country for awhile and I want to mess around with moving the ads around. I installed the plugin ‘Quick Adsense’ and it’s easy enough, but problem is I have to first manually remove the adsense ads that are already implemented on the website before I can add ones through the quick adsense plugin, since you are only allowed 3 max ads. Right now we have two sidebar ads and one on the footer, but I can’t seem to find where I have to go to remove the code from the site. Any help? Thanks.