Put in the CD with your pics on, and then reply to whichever thread you want. On the reply screen, in the part below where you type your reply, you can use the imageshack link to upload your pictures. Just click the browse button there and navigate to the picture you want on your CD, and click the 'host it' button. Wait a minute or two for it to upload and present you with a list of links. Just copy the direct link one and put it in between [img] tags, or use the 'Insert Image' button above the reply box
and copy the link there when it asks you.