How do I go about getting a permit to use a tripod (for an slr camera) on public streets. I am a student.?

Unless you know for sure they are not allowed, you don't need a tripod permit for public streets. You can check the local city ordinances, on their website "whatever.gov", but there is no such permit that I know of. The only place where I'm sure tripods are not allowed are places like an airport, subway, or bus station where heavier than normal traffic is present. If you still unsure or have a concern, you may want to use a monopod instead, which in many cases is more efficient in high traffic/pedestrian activity.