To help line up your images , in your posts ,please do the following-

Click on the paperclip  next to ‘Insert an Image from your computer into your post’

A new window opens where you can browse and find your image. click upload.Click on thumbnail to insert code linking to image into your post.

If you upload multiple images at the same time the code will look like the following-

Note that there is no space between the  img codes. Place your cursor between the ] and the [ and hit your enter key 1 or more times.This will place your images below one another.

The code will then look like-

Hope this helps!