PenciDesign Supporter replied
Hi,
1. If you want to add this code for the page only, please go to Appearance → Customize → Page Options, put your code at Google Adsense Code to Display Before Content Page for Default Template. This field can execute HTML/JS on your page.
2. Yes. The code you've added in the Logo and Header option will apply to the entire site.
Regards,
PenciDesign.