Create User Page
You can create your own user page here to be listed on the community page.
If you only fill out the three required inputs, you will only get the card on the community page. For a full page, the textboxes should be filled out as well.
The textboxes support Markdown.
Editing an Existing Page
Unfortunately, you cannot easily edit an existing page from here. However, all posts are stored on GitHub and can be edited there.
A direct link to the file is at the bottom of each page.