It's not much of a weapon, but my old Dad swore there wasn't nothin' better for crackin' lizard skulls.' and then with this line selected, click on the actions tab:

To add an action, you must first add your line of text, so in this example, 'Here, take this. This is not shown to the player during the game, but a reminder to the builder what happens at this node of the conversation. Before I mention how to add an action you will notice that some of the lines of conversation have 'pipes' surrounding text i.e.

It's not much of a weapon, but my old Dad swore there wasn't nothin' better for crackin' lizard skulls.' has an action assigned to it. More than I deserve no doubt' has no actions apart from the Player has to press 1 to continue. As you can see from the above picture once you say, 'Stay here, I'll deal with the Scaly Folk', Pitney will then have two lines to speak, the first one, 'You mean it? That's mighty good of you. The above picture maybe slightly different to yours as I have removed the conditions column as it is not needed at this point of the tutorial (Right click on any header of the table and then left click on Columns and then select to uncheck the Conditions column).