The text list script is an example script, so you should modify it to suit your needs. Basically when it creates individual line labels, simply add a collider to them (using NGUITools.AddCollider), and they will be clickable. If you need to have any kind of data associated with the lines (such as name of the player that said something), I advise creating a script that you can attach to these labels as well. This same script that will respond to your OnClick event can hold any additional data you need.
