You can add a Featured Image to any page, which in most themes will set the image to the left or the right of your main content area. This is great for adding images to the contact form or side bar images. You can do so by clicking on the "featured Image" link in the bottom right hand corner.
You can then upload an image from your computer, choose a url or choose from the images you have already uploaded to your media library. If you choose from the media library make sure you select the image and click the "show" link.
Select Use as Featured Image
And your page will look something like this: