Basically all of the types of interactions work in the same way, with the exception of the Labeled Graphic and Glossary interactions. The differences in the rest are minor enough so that they are easily recognizable and intuitive. So we're going to do a Process interaction as an example. From that you should be fine to do the other types. The majority of the difference between the various types is in how the program graphically presents the information.
A Process interaction takes the viewer through a series of steps, providing information about each step. As such it is excellent for explaining instructions on how to complete a task. Each step can be shown thoroughly, in order, allowing the viewer to see the entire process.
You'll need to have Articulate Engage open to do this. On the opening screen, click on Create a new interaction. This will open the New Interaction dialog box.