How can i pay a pedestrian ticket that i got three years ago?

If you still have the actual ticket from then, look on the back of it. Contact the municipality where the ticket was issued and ask where you need to go to clear this up. Perhaps you could get the phone number and call that department. If there's a specific dollar amount that you need to pay, they may let you mail in a check. Or, because of the time that's lapsed, you may have to go to court and they may have a whole list of charges for not having paid it before. But you won't know until you call!