You cannot upload them directly. You need to register with a photo hosting site and upload your photos to that. Like Basia we use photobucket which is free. Once you have uploaded them you can either post them as a link or copy by clicking on the second box under the pic which will copy the link to the clipboard. Go to your hamstercentral post and type [img]then%20paste%20the%20copied%20link%20by%20right%20 clicking%20and%20paste%20then%20immediatly%20after %20this%20put[/img]
Your picture should then show on the forum. It is best resized to around 600pixels wide or it can be too large for the screen. If you have a photo editing program you can resize it before uploading to photobucket and it will load quicker.
If you have any problems attach it to an e mail and send it to me and I will put it up for you.