First, post your photos onto a hosting website like
www.photobucket.com which will resize the photos into a forum friendly size, then get the URL for the photo and put tags [img] at the beginning and [/img] at the end. In the case of Photobucket, hover on the thumbnail then click on "URL link" when it pops up, and that will automatically copy the link, and then you paste here and the tags will already be around it.
Hit the "quote" button, and you can see how I typed it in for this photo:
