This illustration shows the Play dialog box which contains the following: 

At the top, displayed left to right is the text, "1. Select User, 2. Play."

Below the text, on the left, is a square gray box that lists the users you can select to run the activity. 

The title Users appears at the top of the box. Below the title is the user jcooper. 

To the right of the box is the Play icon. 

Below the box, on the left, is the Manage Role Mappings link. 

In the bottom right corner is the Cancel button. 

The following items are bordered in red, to call attention to them:
jcooper
Play icon