On wakan, at the top is a tab saying 'tools'. Hover over this then click 'settings'.
Look to the right hand side of this new box. It says 'show phonetic in' followed by 'hiragana/katakana' and 'romaji'.
Click the disc next to 'romaji', then click 'OK'. Now, when you type something in it will automatically come up in romaji instead of kana.
Hope I helped!!!!