Search Bar: the Structure of a Search Bar

A search bar can be built with PopUp + TextField + Button.

This week I'm trying to work out how to archive these components in Unity3D.

The following video is which I learned to get a "TextField" as a container of the search bar to type in keywords.

I've got these codes to achieve the search function. The problem is I don't know how to play with these codes and where to put them in and how to get them work. When I put them into Unity3D, however, they don't seem to work. Have no idea why.. Need to continue it later.