"Pay carefull attention to the messages the angels give you now. You have asked for a sign, and they deliver it. Notice and trust these signs!"
"You've asked for heaven to help you. Now it's up to you to pay attention to the evidence of their help. This card signifies that your angels are trying to get your attention with signs. They might ask a butterfly or bird to fly near you. Or they might compel you to hear a song several times. They might put an object in your path so that you have to notice it. Drawing this card is also a sign from your angels. They are trying to get through -- please notice!
You can ask your angels to give you a sign whevever you have a question or a decision to make. Usually, it's not a good idea to specify what type of sign you'll like. Leave that up to the angels. They are very good at making their presence known." (pulled from the Healing with the Angels oracle deck by Doreen Virtue)
Note: I have asked for very specific signs regarding a specific question and have received it, so I believe both methods work.