FOSS gamedev and creative worlds

I would like to contribute to improve this fantastic game, but since I do not know now create the program for adventure, puzzle and survival map (see Mazebint). I saw the wiki and some topics are really minimal. How can I improve the wiki? need a work permit or are free to edit?

ps. http://minetest.net/forum/viewtopic.php?id=2125

On the Minetest wiki, you have to register an account first before editing (to prevent spam).

Ok, now that I have in writing i would like to contribute, but i don't know where to start, since you're the admin of the wiki you can perhaps make me see a section still not defined or do?

From what I've seen on the wiki, you already created a page. ;)

I am learning to accurately if the various trifle :D unfortunately i can't put the links, because the table anti-spam does not make me go forward ...