Can’t seem to find and edit pages

Hello, thanks for creating this plugin!

I would like to paste some javascript in the head of inevitablebliss.com/home-in-myself

but if I go to the file manager at the back end, and I use the search bar to search in the whole thing (my main folder is called DEFAULT and includes the folders wp-content, wp-admin, and wp-includes, and some other files) for home-in-myself I can’t find anything. I can’t find any other page either, except for some index files.

I read somewhere pages should be stored in wp-content/themes/yourthemename/page
but can’t find any pages there.

I also read somewhere that maybe I would only be able to see php files there because html pages would be stored in the database. I don’t understand this. Does that mean the File Manager cannot access the database? (Than WHAT IS the File Manager accessing?) Totally confused! :O

I hope you guys can help me out.

Thank you so much!

The page I need help with: [log in to see the link]