Have to report my address every 90 days at the immigration office. I'm still kinda new at this so asked for instructions. Thai lady behind the desk said to go office 3, which is next to the passport photo and copier shop. Office 3 is actually the police alien record keeping office so before I had a chance to remember the process (get a photo and copy pages of my passport), I find myself sitting across the desk from a cop, filling out some kind of alien registration form which had nothing to do with the 90 day address report (sneaky pigs). Once they put that on file and wouldn't give me a copy (actually had the gall to tell me the form I had just filled out didn't exist), I was directed back to the original Thai lady who gave me the simple one-page address report form. As implied, all I actually had to do was fill it out and turn it in, along with photo copies of my passport and visa. It took all of 15 minutes.