This is a web ring. go-webring
To add you website to the ring, edit /srv/http/pages/.ring/list.txt
. The format is YOUR_ID https://your-web-site/where-the-webring-links-are/
Then, use Copy Link on links below and put those links on your website. Remember to replace placeholder inside each link with your own.
(legacy feature: host=xxx
works the same as urlpart=xxx
now)