lol "preview" only works if you are using a a IMG tag..if you attach a picture it still won't show up in preview mode.
After you click Browse and find your picture click Add This Attachment, then scroll back down to where you added the picture and click Add Into Post.
Then look in the text box, where you have typed your post..you'll see something similar to this ----> [ attachmentid=30043 ]
If it put it at the very beginning of your post and you want to move it.
Left click and high light it with your mouse; then, making sure you keep the cursor on the highlighted portion, right click; then click cut. Move your cursor to where you want the pic to be...then Right click, then click paste.