expression
what should I do?; how should I do it?
Used in questions when asking for advice or the correct method. Often implies uncertainty about the proper course of action.
この機械が動かないんだけど、どうやったらいい？
This machine isn't working—what should I do?
パスポートをなくした場合、どうやったらいいですか。
What should I do if I lose my passport?