For film, you can either scan the negative in a negative scanner (highest quality) or scan a print using a flatbed scsanner(lesser quality). Once saved into your computer, you will need to upload the photo to a photo hosting site. I believe there is a way to do it here, but I have yet to be successful in doing so.
Once uploaded to a photo hosting site, there is usually a way to copy and paste the location of the photo (does that make sense)into the message board you are trying to post your photo to.
I usually use photobucket.com. The photo below was uploaded to that site and the link copied and pasted into the message.
Does anyone else know how to post photos on these pages.
I just tried the Insert Object button below the message typing page to insert a photo of me in Beijing.