I did not register for selective service, and now I can't get approved for a studend loan.

Go to: http://www.finaid.org/students/selectiveservice.phtml The very last question on the page: What If You Didn't Register and It's Now Too Late? You will find detailed information explaining you have to write a letter that shows by a preponderance of evidence that your failure to register was not knowing and willful. The term "preponderance of evidence" refers to the standard of proof used in civil litigation, where the evidence for a fact is of greater weight or more convincing than conflicting evidence. In other words, the probability that the assertion is true must be greater than 50%. The site also provides detailed explanations of "knowing" and "willful". Your schools financial aid counselor should be able to help you with this. I hope this helps! Good Luck!