Adding Clickfunnels popup optin code to Homepage

Hi,

I obtained some code from my clickfunnels account that I want to add to my website.

Firstly, I followed this instructional video and when I added the code to the widget, instead of the
popup appearing in the middle of the screen like it did on the video, mine appeared on the side, because that’s where the widgets appear. Even though I followed the guy in the video.

So, I removed the code from there and added it to my ‘about’ page and it works.
What I want to do though, is add it to my homepage, so that when people enter the site the optin popup appears on the homepage, but as the homepage is created automatically, I can’t just edit the code.

How do I add code to my website behind the scenes so that my optin appears on my homepage instead of my about page?

Thanks very much

David