@1tess - if they're your own photos, you can do what you like with them. :) As raincoaster says, the default there is All Rights Reserved which is what you'll see if you don't choose the Creative Commons option.
@cyndiheath - most people, unfortunately, just take images. This is not necessarily deliberate stealing, many of them don't understand how to use photos they find online. But unlike you, they don't try to find out first.
Here's the link to how to properly attribute Creative Commons licensed images:
And by the way, by far the easiest way is to get the images into your blog post via the URL option in insert images (in the post editor) then you can post the image directly and it will automatically link back to the original photo and that photo's page. But you should also put a credit below the photos in your post.
Apropos finding photos that you can use, the simplest way is to use this Creative Commons search: