First get your pictures on your hard drive then register at a photo hosting site. I use photobucket.com. Upload your photos to the hosting site. On DCSki use Full Screen Reply. In the tool bar click on the third button, 'enter image'. From the host site you'll need the URL for the photo you want to display. Enter this in the box that appears when you use the 'enter image' tool. Hit OK and you should have it:
This is a picture of me with my first skis taken during the '64-'65 winter.
I hope this helps.