How I add search icon instead of text "Search" in search bar?

Design help General
4

You can create your search form any way you like.
If you choose to, you don’t need a button because HTML5 supports “implicit submit” when you press enter on an input field within a form.

In Webflow a search is always pathed as;

/search?query=...

So in your form, set the action to /search, and the method to GET.
Give your INPUT field a name of query.