When you are signed in to your site, you can navigate to other pages by using the button at the top of the screen titled "Page Navigation". This will present all the pages on your site so you can jump directly to them.
1. To see the button, your top toolbar needs to be expanded. To do this, click on the plus sign in the upper right hand corner of your browser canvas.
2. Simply click the page you would like to navigate to.
If you're looking for information on how to adjust the navigation then please see Managing main site navigation.