It is fairly easy...
First you need to set up an account like
www.photobucket.com. It's free, works very well here with the boards, many use it.
Once set up, just follow the steps on that site to upload a picture, or pictures. Once uploaded, just go back to where you can see your pictures in your photobucket album.
From there you can create albums for future use or just keep them all in the main library.
Once you see your photo click on the one you would like to share..
on the far right side under the ad you will see a box that says " link to share this photo"
"img".... click inside the IMG box... it will turn yellow and say copied...
then come back over here... and in your post click "CTL V" and it will copy your img code in the thread. It will then post you photo when you hit post reply...
Make sense???
If not, let me know.