Your images are likely too large to upload directly to the site. I use Microsoft Paint to resize. Right click the image, "open with" Paint, choose resize (I go to pixels and set vertical to ~800), save as (assuming you want to keep the full size version). Once done, you should be able to upload directly here. If your a Mac user, I would speculate there is a similar program to accomplish this. This resize process is easier for me than a 3rd party host, and it will also stay a part of the forum (vs disappearing in the case of Photobucket when the winds of change happen).