how to set automatic rotation

[d@nny]

hey im a newbie to irfan view and all the plug-ins. As im arrow-keying through my images I'd like if they were to be auto-rotated 90 degrees so I can view them sideways (length-wise) on my monitor (its length is longer than its height). I see the option 'Auto rotate image according to EXIF info' how do I edit this EXIF info and do this? Basically I want all my images to automatically as if I pressed 'L'. I noticed I can batch all my images and have them rotated..ill try this for now.

[Bhikkhu Pesala]

The Exif rotation data depends on how the camera was held while taking the photo. You cannot edit this data in IrfanView.