Click on + Add and popup window will appear.
To organise all relevant content under an icon, simply drag and drop the content from the add content pop-up window.
After you add content, you’ll have the option to choose view for you news; dropdown or list.
If you choose dropdown, you’ll see first content source like this:
and other content source can be selected in the top right corner.
If you choose list display, you’ll see all content sources at once:
and you can add images, title, description and icons for all items to make it look better.