Go to your photos section of GT5, select the photo and hit export to XMB. Back up out of GT5, and under the photos tab highlight the photo and press triangle. Hit copy. Plug in a USB drive to the USB port, wait a second, and press X. Then upload the photo (now on the USB drive) to a photo hosting site (I use Flickr). Right click on the photo from the site once it has uploaded and click "open in new tab". Once the new tab opens, copy the URL (long text at top of browser) of the new tab. Go to your post in GTP and click "add image". Paste the URL into the box and you're done.