It's hard to give a definitive answer without knowing the context., but here's some ideas. - 언제 X-라고 (말)해요? = When do you say X? e.g. "언제 '잠깐만요'라고 해요?" - X-라는 말은 언제 써요? = When do you use the phrase X? e.g. " '글쎄'라는 말은 언제 써요/사용해요?"

hi can you help me to use this app please send me a msg to teach me i cant understand ...

hi can you help me to use this app please send me a msg to teach me i cant understand ...