How to find entity in search box

I am using Cesium-1.34 and I am trying to do a very simple thing. I want to find through the search box the entities I have created by their name.
A clear example of what I want to do is shown in the demo presented in the website:

In the link above you can find the satellite by typing its name in the search box.

How can I do the same for example when I create a point or a line or a polygon for example?

Could you provide some explanation please?