1. Right click on the picture you posted on this thread, then save it to your photos file.
2. Go into your photos file, find the picture and right click on it, select "edit".
3. When the picture comes up in the edit box, one of your options will be "rotate". You can rotate the picture left or right 90 degrees or 180 degrees, then hit "save" and that should do it. Then re-post the photo from your host.