Hi BomNya,
Under the Quick Reply window, you'll see a preview link (pic 1). Click that. In the new screen, under the typing box you'll see a link labeled Attachments (pic 2). Click that. On the new screen you'll find options for selecting and uploading files. If I recall correctly, I believe you can put up to 5 pictures per post. Keep in mind that the pictures will be displayed in the opposite order of their upload - so the last picture you upload will be the first picture displayed on your post.
If you have more than five photos, start another reply post.
Does that help?
Cheers, Eric