Hi Gianna,
Thanks for the purchase. To update your logo, you have 2 choices.
1. Simply replace the current logo with your own. Replace the image located here:
www.yoursite.com/templates/shape/images/logo.png
2. Use the total control parameters in the template manager and add your logo there. Here is a little more info on Total Control.
simplex.pixelpointcreative.com/features/total-control.html
The photos at the top of the page are using a module. Log in to the admin, go to module manager and look for simple spotlight. You need to edit this module to update your pics.
Let us know what else we can do to help. Thanks!