It's simple. Click an existing article and at the top of a page there should be an "upload" button, zip up all of your images you have posted here on your computer, on the upload page click "Browse" and select your zip folder with all the images in it, tick the check-box under the filename and hit "Upload", when everything's uploaded, right click the link with the text "View your gallery" and open it in a New Window or Tab.Now, in the tab/window with the upload form on it, go back to article listing and click "New Article", give it a title and copy and paste in the image code for each image (the three text fields below each image in the gallery you opened in a new window). When you're done click "Update" and the article is then on the Wiki.There's a rough guide here:
http://x-cult.org/newegg/faq.php with pictures if it helps.