You can use the slider control, found at the bottom of the timeline panel to scale the amount of time you can view.
Moving it to the left shows you a time scale in seconds instead of milliseconds, so you can append more transitions.
Does this answer your question/work for you?
Hi Tara, thank you for taking the time to answer my question. However, if I move it to the left the furthest I can see on the time line is 18secs. What if I want to place an action past 18secs, how do you move the timeline further right?
you just drag the hole thing out so that it starts past the 18 sec one.