If you'd like to edit these articles, you can get credentials to do so from OldCoder. Talk to him in IRC or send email.
If you're a candidate to edit, you either have or get the required contact information.
The articles are written in Markdown, which is similar to ordinary text. So, no experience with HTML is needed.
Edit access to the main site should be available later this year. However, note that that site uses a different markup language named Haggis.
Haggis, the language, is to Markdown as Haggis, the food, is to ordinary comestibles such as a peanut-butter sandwich. It is, in short, interesting but eclectic.