Trying "Passing Values Between your Pages", but it doesn't work

Hi, I’ve checked this tutorial Passing Values Between your Pages

but when I click “online” image on http://174.138.46.199/ , it seems that the page moved to the lined one (./search/) once, but came back to the original page again. how can I keep the linked page shown?

スクリーンショット 2020-05-10 17.19.10796×428 54.9 KB

what I want to do is, when click this image, I would like to set value “on_offline=1” and pass to the next linked page.