Heya, welcome to ThePhotoForum.
Many of us load their photos into Photobucket (www.photobucket.com) or have a Flickr-account (www.flickr.com) - you can also try FastPictures (www.fastpictures.com), which I use, too, among many other options. You load your (resized to an uploadable size) photos into those photo host accounts, they are then given a URL of their own, you copy that - either within the brackets already, or you put it round when putting the link to this forum.
There is a "How To..." on posting photos to here somewhere, let me see if I can find it for you.