Hi guys. If I want to use the action of Jyn Erso crew but then I notice that my friendly ship that I want to choose is out of range 2, can I do another action instead of the Jyn Erso crew action?

Yes, if the chosen ship is out of range, then you haven't performed any action, and can try a different action instead.

Thanks

If the friendly ship is out of range the action fails and you are allowed to choose a different action but if there ends up being no enemies in range and arc the action is still succesful and will assign 0 tokens to the chosen ship.