This blue bar at the top is your admin menu. This only shows up when you are logged in, and it gives you access to the administration pages of your site.
NGP VAN Logo: You can click this at any time to go to the front page of your site. If you ever feel that the site hasn't updated with your most recent change, you can use the 'flush all caches' link in this menu to force a refresh. Caching keeps your site up if you get swamped with lots of traffic, so the expected behavior is that the site may not update for about 5 minutes after you publish a change.
Content: You can see all the content created in the site here, as well as create new content.
Structure: You can manage what shows up on your sidebars, or 'blocks', as well as edit your contact form, and access your main menu administration screen here.
Appearance: You can upload your logo, choose your theme and color scheme here.
People: You can see existing users with website access and create new website administrators here.
Configuration: Here you can configure different settings of your site that aren't covered elsewhere, such as setting up your Google Analytics tracking code, or set up custom redirects and aliases.