SEO Pixelpost 1.7

[Kev]

Hi,
i am new at this whole pixelpost platform and i want to ask you how can i make this add-on work, SEO Pixelpost 1.7?

I've uploaded the files on the server but in the instruction it is said "To work properly it needs in head section code with your blog URL"

Where should i put the code, and what code is that?