Previewing your version is a great way to see how it will appear to your readers and test any interactivity that you have set up.
There are a number of ways to preview in your account.
Using the View option on the homepage thumbnail
Selecting the View button on the Manage page for your version
Using either the Page Preview Page or Version Preview tabs within the Designer/Interactivity editor.
Will open the page you are currently working on within Designer/Interactivity.
Will open a new tab so you can view the whole version, including any toolbars and/or menus.