To make your post look like you want it, forget about the Manage Attachments button down below. Hit the Enter key to move the flashing cursor (|) to where you want the picture to be inserted. Hover your pointer over the square icon above that comes up as "Insert Image" and click that. It will bring up a dialogue box with a choice "From Computer". Make sure that one is selected and click "Select Files".
Select the photo you want from your hard drive and click "Upload File". It will load into your post, with the cursor at the bottom right-hand corner. Hit Enter once or twice and type some more text. Hit Enter again and repeat the process to insert the next pic. Repeat for effect.
If you select more than one photo in a fetch, they will still appear in alpha-numeric order.