Say, for example, I want to post a picture of my dog Woody. I go to the attachment part of making a post and click the "inline" box. I then click "browse" and find the picture of Woody that I want to attach. I then click "Upload Attachment."
I type the text, "This is my dog Woody," and I insert the following code below my opening words.
This is my dog Woody!
[inline woody 1.jpg]
I click preview post to see if the magic worked and nothing comes up. The reason why it didn't work is that I didn't name my picture correctly. I then go back to my picture, change its name from "woody 1" to "woody1" and upload, for the name of your pic has to be continuous. i.e. [inline duckboat1.jpg]
So I try it again, this time typing in the appropriate code.
Then I go to "Preview Post" to see if I got it right. The picture size has to be less than 100 KB, otherwise it won't work.