With that name you must be an exceptional individual. Welcome to the forum.
Here is a link to a FAQ
that gives you several ways to post a picture. If you still need help send me a PM.
To size your photos you need a photo editor. One of the easiest to use is Picasa 3. You can down load it for free from Google. It allows you to make simple changes to your photos including sizing. If you size your photos to a 4" x 6" size, or smaller, you well be OK to post in a thread.
Edit: Since this post was made there has been an automatic photo sizing program added to NAFFF. So the sizing of the photo is not as important.