At the moment, a Page must be created from the website. Once it's added, you can post content from either the web or the mobile app.
Go to the Newsfeed tab and click on Create page.
In the fields that pop up, enter a Title for the page and provide a description. Then, choose which employees, groups, locations, or positions should see the Page.
Once you click Save, the new page will appear listed on the left side of your Newsfeed. You can select it from there to view activity and comments for that page.