Pages in WordPress are created from the 'Pages' section in the WordPress admin area. You can click on the 'Pages' link to show all the currently created pages.
From this page click the 'Add New' button to create a new page.
From the 'Add New Page' screen you can enter the title for your page and insert the page content in the content are below the title.
WPBakery Page Builder
If you've enabled the 'WPBakery Page Builder' (previously Visual Composer) plugin which comes bundled with inVogue, which is recommend in order to make use of the full functionality of the theme, you should see the option to switch to the 'Backend Editor'.
Once you've switched to the 'Backend Editor' you can begin by clicking the 'Add Element' button to being adding content to your page with WPBakery Page Builder.