When i'm typing in kotoeri kana typing mode, how do enter 'ro' ?

So, yeeaaah

How do I enter the kana ろ on my non-japanese keyboard. I think it's an international-english keyboard, as I'm from holland.

The key where it's supposed to be -between the shift key and the む- is not there. There's just a very wide shift-key

Is it possible to reassign a key for ろ? There's this key next to the 'z' that doesnt really do anything... just some weird comma.

Many thanks all