First off put your pictures on your computer in, say - Document. Then get a free account (Really - it's free) on something like Photobucket:

http://photobucket.com/

Then transfer the photos from you computer to your new account - instructions are easy. Then when you wish to add one to your post, read the simple directions on how to Copy & Paste the URL of the photo to the proper icon on your post.

It's mostly reading. You'll have it done in two tries.