How can i customize this dialog , so that i can add my own buttons, or text input. For example i want to add text field where i insert number or text.
Hello and welcome to the forum!
In short: you can’t! This is the “more-info” dialogue, that comes as a standard with every entity.
What you can do, is making your own pop-up with browser_mod and there you’re able to setup your own infos.
Thanks!
Is it possible (with browser_mod) for instance, when i click on icon or buton that represents certain TV, a pop-up appeas and i can have a text field where i input a number, and a butoon, so that TV changes to that butoon?
Sure it is! 
You can put anything you want in a pop-up (browser_mod).
But I’d suggest, as a new user, take a look around, and see if there isn’t something that already fits your needs, eg. a TV remote card:
As a general rule, nearly everything is possible with HA, it just depends on the way how to get there, and how much effort that way takes.