What is the process for filing a TM30 in Bangkok, and how can I submit it online?

TM 30 question

I know this is a highly discussed topic and that there are plenty of posts about it already in this group. However, scrolling through the search results i haven't found an answer. I have never filed tm30 before and my landlord never had a foreign resident before. I couldn't find a blanko form on the bangkok immigration website (I'm sure there is but the website keeps crashing). I found plenty on google but they're all slightly different and I'm not sure if bangkok immigration asks for one specific form. I stay at khet nhong khem and I'm not sure which immigration office i have to go to (never stayed in bangkok before). Also I've heard that i can send it online but same here, google didn't give me the information i needed (i admit I'm not very fit on the internet). Also do i really have to submit within 24 hours after arrival? Thanks for any leads in the right direction. 😊