Signup for Snap Shots at https://account.snap.com/signup.php and generate the necessary JavaScript code. In the code you will find a 32-character parameter in the src tag of the javascript. This will be needed for configuring the display.
Download Snap Shots(TM) Integrator.
Extract the contents of snap-shots.zip to wp-content/plugins/ folder. You should get a folder called snap-shots.
Activate the Plugin in WP-Admin.
Goto Settings > Snap Shots and enter the 32-character code you obtained in Step 1.
You can configure the plugin to automatically add the code to wp_footer() (This needs to be present in your theme). Alternatively add <?php do_action('echo_ssi'); ?> just before the .