well basically, from the very beginning- you save your photo somewhere, anywhere really, but perhaps the best place would be somewhere like my pictures. next, you go to an image hosting website, try
http://imageshack.us. there you'll find a page with a blank bar, a browse button, and another button below it that says "host it." first click browse which will take you to all your folders and programs and stuff. locate where your photo is and double click on the file of the photo. then the file will be written in the blank bar. simply click host it and there you have it. it'll take you to a page with links that you can use for websites, forums, etc to post your pic. i know my explanation is a bit confusing, but it's the besti can do and i apologize. hopefully it won't be too much trouble.