I can not find how to create functions on free one!!!!
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Found it -.- thought it would be added on event sheet and not in layout as an object T_T
you missed to say that on the tuto.
scirra.com/manual/149/function
You can notice what you've linked is a manual article from a plugin.
By default all plugins are objects you add to your project, I'm not sure it's a requisite to repeat it in the manual article for the object itself.