1) When making a reply (make sure you're in Full Editor to have this option), scroll down past the text box, and under "Attachments" click "Browse..."

2) Once you have clicked "Browse..." a new window will open. From here navigate to the desired picture. Select the picture and click "Open."

3) The window will then close and the path to your picture will be displayed in the box next to "Browse." Next click "Attach This File"

4) The image may take a couple of seconds to upload. Once it does, it will then appear between "Attachments" and "Browse..." Make sure that you have uploaded the correct picture. Now, click "Add to Post" and the code for the picture will appear in the text box.

5) All you have to do now is submit your post, and that's it!