What do I need to register my change of address for my 90-day report at immigration in Thailand?

To register your change of address in Udon Thani for your upcoming 90-day report, you will need to ensure that your landlord has completed a TM30 form when you moved in. This form is crucial as it registers your stay at the new address with immigration. Additionally, have a copy of your rental agreement on hand, as you typically need to file your address change within a specific timeframe. Visitors have reported that the process can be quick and efficient.