Is it OK to change my address after the resident registration at the Municipal Office?

Yes, you can.  Please let us know the new address whenever you change your residence.  
Also, you need to report to the municipal office about your move out/in when changing the address to update the information on your residence card . 
If you couldn't find an answer to your question or concern, you may inquire us through the questionnaire form we shared when sending you the Letter of Acceptance or the questionnaire form shared during the orientation. If you are not applicable to these, inquire from here.