Is it free version can extrude?

Hello !
a question about modeling…
is it free version can extrude?
make 3D modeling?

Yes. But you will need an Apple Pencil and an iPad Pro.

yes I have it but i’m still can’t do it. why?

You have to press and drag to extrude. Have you seen the basic tutorials?

Check out #3, called “Basics”. Does the pressure meter work for you? If it doesn’t, there is might be something wrong with your pencil’s pressure sensitivity.