UI Button no function onClick

Hello, i’m newbie with Unity, and i watching a lot of tutorials etc. I need make button with canvas, but if you can, tell me why everyone on videos/screens have something like that:

And i have:

On Click (Button), i don’t have it, and i can’t put there script, why? I know that i can use function and listener, but on videos everyone making it easier, can i too? or it’s not available in Unity Free version?

Thanks for answer.

debug mode

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Thanks