You need to install an Arabic Version additional to your normal version. It is included in the CC subscription, change the language in the CC desktop app preferences and install it again, this will add needed functions.
Take care that your Para Style uses the correct language and one of the world composers.
OK. I will try.
The problem is that I have the CS4
You can use the World Tools plugin from In-Tools.com. I think there is a free trial.