Adding a meelee attack to character in Gdevelop 5

How do I make a meelee attack in GDevelop 5?. I need it to work whenever the player is flipped or not.

Do you know this tutorial?

You can also look at how I did it in the Not-a-vania example.

Could you please link it?

No link necessary. It is built into the main example list within the engine itself. Within the engine, go to the new project window, and click the “More examples” link on the upper right. Then search for “vania” and it’ll be the first result.