我正在尝试在WordPress主题中更改占位符，但我无法找到它存在的位置

I use a WordPress Woo-commerce template called "KuteShop", and I am trying to change the Placeholder Text "I'm searching for..." and "All Cate." as in the picture below:

but I can't do that, I searched everywhere, NOT in the Advanced editor, NOT in the Theme Options, NOT in the WordPress Settings, Nor in any place.

How can I modify it?

The process is really simple, KuteShop include a language file: "languages/kuteshop.pot"

You simply should open this file with the PoEdit application (that is distributed for free: https://poedit.net/), and create the language file for your website's language, entering a hypothetical translation of this text with the text you want to display on your website.