One of the important items of a map is to convey data to the user. Allowing them to inspect the data to get a fine-grained sense of the data is easily accomplished by creating a popup that appears when the user clicks. You can select the fields, their order, and even show photo galleries.
First, go to the layer settings. Once there, select the popup tab on the left hand side.
Once you are there, first enable the click popups. Then select the fields, alter the display name you want, and reorder them as desired.
After saving them, you can test them in the UI.
Also notice that the Click Popup tab has a green indicator to let you know that a click popup has been created.