How do you let a man know you find him attractive in public?
You know those moments when you're on the bus or walking along the street and a nice guy catches your eye or you see him checking you out? What do you do as a woman in those situations?
Step one: Make eye contact.
Step two: Say something. A simple hi, or hello will suffice.
Step three: Wait for his response. If he's giving you any signs that he's interested, he'll either initiate a conversation, or he'll be responsive when you initiate the conversation. Good luck!
I hope I've helped.