NOTE: This will work for any picture.
First, go to an image hosting website and make an account. I personally use photobucket, as it its easiest for me.
Second, upload the picture. This, on photobucket, is by clicking the "Browse" button next to a bar under the "Upload to: <album name here>" text. Find your photograph, then double click it to fill in the bar, which will display a path from C:/ (usually) to your file. Then, click Upload.
Once it is uploaded, you should click on it. The photo will come up, and depending on the size of the photo, will probably be downsized to fit the screen, or to a certain percent. Find the text "IMG Code - Forums & Bulletin Boards" or something along those lines, copy it, and then open a posting page. When the posting page is open, paste the code into the post. You should now have a post that looks like this:
Congratulations! You have now hotlinked the picture to your post! Way to go! :Sylvia:Whatever, blah, blah, etc.
Blah, blah, <insert text here>
Sahdrani
EDIT: Dammit, why can't I hotlink a picture in a thread about posting them?!
EDIT2: Never mind... fixed it... >.<