Image positioning help in blogs/posts

Okay, currently I'm trying to write up a blog on DOA. I'm trying to put multiple images in the blog from off the site. I have a Main header image a row of several smaller images which works out fine but when i insert a new image its inserting the new image at the top of the page near the row of smaller images and when I click to move the larger image to the bottom where I want it.... the large image AND all the smaller ones move. Its really aggravating... how do I get this thing to insert images where I want them too? I wanna make my blog look all pretty and whatnot but fighting this image placement issue is a real pain.

Make sure your cursor is positioned at the line you want. If the images keep bumping each other, they might need to be spaced apart more.