To add a mobile page type to your app, go to its dashboard, then access the "Edit pages" link. Once re-directed to the app editor section, click on "+" button to add a new native page to your app. From the appeared list select "MOBILE" and click on "Create" button. 

Now you may go to edit the mobile page itself. 

Here, you need to input the url link for the mobile web in the "Page Url" field. Remember, in order to have the mobile web work within your app, you need to make sure to enter a valid url link. 

Also, you may find the option to select one of the most popular mobile web pages, such as (simply by clicking on their icons): 

 http://m.flickr.com/#/home

   http://m.wordpress.com/

 http://m.ebay.com/

 http://m.youtube.com/

Thank you, 

Ethan

Please, consider opening up a support ticket for further technical assistance. 

Thank you, 

Ethan