A graph will appear and begin plotting responses every 5 seconds (can be changed), see below for an example:
1) Run every x seconds - This section is where the time interval can be changed, simply chose the time interval from the drop down menu.
2) Summary Interval - If a response times graph has been running for a long time then changing the summary interval will allow more data to be shown in one view.
3) Tooltip and zoom - Hovering the mouse cursor over a particular point on the graph causes a tooltip to appear with the time and value at that point. Also using the left and right mouse click will cause the graph to zoom in and out.
4) Controls - Clicking this button will hide the summary interval controls.