Instead of attaching the images, you have to host the images somewhere offsite (photobucket, flickr, imgur, etc), then link them back here.
So you would write up the text, then paste in the image URL(s), write up the next section of text, paste in the image URL(s), and repeat as often as needed.
If the hosting site offers image URL format options like photobucket does, you want the one that starts with "[URL". That would be a straight copy & paste operation.
Alternatively, you can grab the "[img" option if the URL one is not available.