When posting, use the option "Go Advanced". Either use the paper clip icon at the top to upload photos directly from your computer, or use the "insert image" mountain icon to link to a URL where the photo is hosted, such as on Photobucket or Imagecave.
I could be wrong but I think if you want full size you have to use photo bucket or similar on line hosting site. If you upload from your PC it will be a thumbnail. Which is no problem the image can be enlarged by the viewer.
Thats how I roll anyway. Wonder which format is better for the forum?
Uploaded from PC not sure why it is not showing thumbnails.