A simple worked example:
Start with a blank canvas.
Add four agents, labelling them 'a','b',''c and 'd' as you go.
Click on the 'Build a sequence' icon.
In the pop up window click 'Auto'.
You will see the four agents labelled 1 to 4 in the order you added them.
Close the pop-up window.
Now use the four Blue Arrow icons to present a slide show: clicking Start makes them all disappear; Next to reveal each agent one by one.
Now bring up the 'Build a sequence' window again and manually change the order by first selecting a number, then applying it to an agent. For example, click on '5' and then click on agent 'a' for the 1 to change to 5.
Now close the window and run the slide show again. This time the order will be b,c,d,a