when I input "o", will get "お", but how can I get "を" using anthy?
when I input "ji", will get "じ", but how can I get "ぢ“ using anthy?
when I input "zu", will get "ず", but how can I get "づ" using anthy?
Look for a version of romanization with the method of the Japanese government.
type wo to get the を
du for づ
It's often written by native Japanese as
This isn't an anthy error, it's simply a matter of getting used to romanji. Also, in case you haven't hit this yet, though I suspect you have, as it's more common, for watashi wa, you would write wa as ha.