[xwiki-users] adding a code snippet to http://code.xwiki.org/xwiki/bin/view/Main/

Hello, I just started to use xwiki (and I am quite new to wikis but understand their basic concepts), and in the process, developed a bit of code which I would like to share (add to the code snippets on the xwiki). I have a user account on the xwiki.org and can log in. Every time I use the "Add Snippet" button, it opens the form to name the page (which I fill in), then there is a form with large window where I suppose the programming code is to go (this large window ends with {/pre}). But, every time I put the code into the form (even starting it with {pre}), the code never shows in the preview (it is a velocity code snippet BTW). So the question is, would you please explain to me how am I supposed to add the code snippet to xwiki.org? Pointers to documentation welcome. Kind regards, Vlad PS: This is obviously a combination of me being a beginner at xwiki and not understanding what stuff is expected of me where, when adding the code snippet.