Technical Help wanted for Blogger

You may ask why I don't look this up in blogger help, in truth, IF I can find what I'm looking for the language is far beyond my ken.

I have figured out how to arrange the images in order by cutting and pasting the HTML, but all four of these images were loaded as MEDIUM/RIGHT
My question is; how do I ensure they stay stacked one above the other on the right hand side of the page as opposed to what you see here.

If you can help can you use plain/idiot speak please.
TVM