*@Miłosz Borowiecki* Hey! As I don't know what's the option you don't have, I'm going to have to guess. I'm guessing you are missing the option to create and edit actions. To get it you'll have to be in the Dopesheet editor, and in the top left box of the dopesheet next to the editor type you'll need to change the type to the action editor.

You can check this video where I explained this editor more in detail: https://cloud.blender.org/p/character-animation/5ce406244bb86e9ddd8cb055

*@Nacho Conesa* Thank you !!!