The Benevolence theme comes with two page templates to display causes.
Setting Up a Causes Page
To display either a list or grid of causes, first create a new page by selecting Pages → Add New from the main menu. You can name this page whatever you like, give it a header image, etc.
Importantly, select either Causes Grid or Causes List from the Template section of the Page Attributes box. Save the page. Your causes will now be displayed on that page.
Add the page to a menu using Appearance → Menus, or link to it from elsewhere on your site, to make your causes page accessible to users.