How to change the iPad interface language from Chinese to English?

On my iPad's 'Settngs' software I was selecting Chinese and Arabic keyboards to enable input in those languages which I am learning and went on to activate those languages in other settings also. This somehow changed the interface language to Chinese and now program names and menus in 'Settings' program are all in Chinese which I cannot understand and thus cannot go back to English. How to change to English language without having to restore or reset my iPad as I do not want to loose the data in it.

Thanks

Mustafa