@Ted *****
You were totally given the wrong information when you bought the visa. The visa you hold is valid for a year from the date it was issued, it is good for entries of 90 days ONLY. When that 90 days runs out you go to the border, stamp out of thailand, stamp in&out of another country then stamp back in to thailand to get a new 90 day stamp. You do that the for the whole year the visa is valid for every 90 days and you can get 15 months of stay out of it.
You NEVER do a 90 day report at the immigration office because you can't be IN the country more than 90 days on that visa.
NOW if you don't want to do what I just outlined you do every 90 days (exit/re-enter) you CAN go to the immigration office when you ahve 30 days or less left on any of the 90 day entry stamps from this visa and apply for a yearly extension by meeting the proof of funds requirements and turning in the correct documentation.
IF you are wanting to get a yearly extension go to your immigration office and get the hand out that lists the requirements for either the married to a thai or the over 50 retirement extension. Once you get the yearly extension then you will start doing 90 day reporting