Add as many menu items as you want (at least two items) by clicking the grey "Add" button.
For each item, fill the title textbox and set its content using the "Edit" button.
A dialog will be opened and you can fill it with any content, as you would do in a regular Concrete5 "Content" block.
Once saved the content, you will return to the menu items tab and you will see a preview of the content you entered.
You can drag and drop the items to reorder tabs whenever you want.
Finally, fill some visual options to change the look and feel of the menu: size, active tab color and caption, inactive tabs color and caption, content background color, numbers in tabs and if you want the tabs to be animated and paused on hover.
And that's it! There you have your Easy Menu Accordion working.