What is the correct procedure for filing a 90-day report online in Thailand?

Did my 90-days report today in Kanchanaburi immigration, not busy, so quickly done. I asked them about the online system, since i'm trying to file it online and always return to the start screen after a pop-up says i have to contact my local immigration office. One of the officers said that, if for example your 90-days report should be done on the 15th, you have to do the online report between the 1st and 8th of that month, so, in the first 7 days prior to your 90-days date. Is this correct, i asked them because i was thinking it not worked because of google chrome