This tutorial is kindly provided by the plugin developer. You can access the full plugin's documentation on this URL:

The Beaver Builder Plugin is integrated into all VamTam Beaver Themes. 

In order to start building layouts, open any of your pages in the Pages section of your website Dashboard. Within each page, click the Page Builder tab to launch Vamtam Beaver Builder.

Start Vamtam Beaver Builder for a new page:

When you create a new page, start Page Builder from the Add New Page or Edit Page screen.

Click the Page Builder tab to the right of the Text Editor tab, as shown in the following screenshot.

Start Vamtam Beaver Builder from the Admin bar:

After you have saved a page that was built with Vamtam Beaver Builder, you can click the Vamtam Beaver Builder in the WordPress admin bar to open the page for editing with Vamtam Beaver Builder.

Guide to Vamtam Beaver Builder