The recommended way would be to create a new page by going to Dreamweaver Menu > File > New > 'Page from Template' > and select the 'Main' Template to create your new page.
However, what is probably easier, would be to just open the kind of page you want your new page to be like (i.e. shipping.php), and (again in the Dreamweaver Menu) select 'File' > 'Save as' - and save it as whatever you want your new page to be called (i.e. news.php).
Then go to your online store Admin area, and select 'Content' > 'Add new Content'. Enter something for 'Page Name' and 'Content Area' (i.e. 'News' and 'Content') and click 'Insert'.
From the next page, copy the 'Developer Notes', which will be something like:
echo WA_getCMSContent($database_PowerStoreConnection, $PowerStoreConnection, 'News' , 'Content');
and back in your new page in Dreamweaver, in code view, find the lines at or near line 299-300:
<div class="contentBox"><?php echo WA_getCMSContent($database_PowerStoreConnection, $PowerStoreConnection, "Support", "Shipping"); ?></div>
And replace everything between <div class="contentBox"> and </div> (in blue above) with the code that you copied from the Developer Notes. You will probably also want to change the '<h1>Shipping</h1>' heading to 'News' or whatever you want the heading (if any) to be.
Save and upload your new page to your remote server.
To link to your new page, go back to your store Admin, > Content > 'View/Edit Content', scroll down to the area for 'Page Name: Home Page, Content Area: News' and click the edit icon to the right.
You can either add the link to your page by highlighting the 'Learn More...' text, clicking the Add link icon, and entering the filename of your page, i.e. 'news.php' in the 'URL' field, or by clicking the 'Source View' button in the Editor and changing '<p><a href="#">Learn More...</a></p>' to '<p><a href="news.php">Learn More...</a></p>'
This gives you a new page in the style of the rest of the store that you or your clients can update through the Content Management System.