Once you have read the rules and mentally agreed to them, please submit your website to this form!
There is no curation process - pretty much anyone who joins will be listed on the directory! As long as your site follows the rules of "no kid RPF, no spam, no malware, and no hate speech", you'll most probably get in.
If you leave your email in the relevant box, I can message you once I've gotten your site up on the directory. I will try to get to new submissions every couple of days, though it may take longer if I'm busy.