First, you will probably want to look through the photos online, in order to see how the session turned out. The gallery allows you to view thumbnails, individual photos, or an online slideshow.
To see the full, high-resolution photos, you'll need to download the images. You can do this one at a time, or all at once.
Think of the digital download as a "product"...at least that's the way the gallery works with it.
To download an individual photo, just click the "Full Resolution Digital Download" link in the upper right, then complete the checkout process in the Shopping Cart:
To download the entire gallery, first select all of the photos, then choose the "Full Resolution Digital Download" as the product, then proceed to the Shopping Cart. Here's a two-minute video walk-through of the process: