I was wondering if anyone can give me some advice on the following in packet tracer.

I have only just started using packet tracer so I am not that hot on the software - for one of my exercises I need to go into simulation mode (which I am ok with) and go to options and show packets. I then need to set up a packet to flow between 2 nodes?

Please can anyone give me any guidance or direct me to a tutorial?
I have searched the net but cant find what I am looking for.

thanks in advance.