It's pretty simple. It goes like this:
1) Edit Mode > Scene Menu > Add Atom
2) Choose Triggers > Button Trigger and check Select atom on add, then click on Add Atom.
3) Enter some text, like "Pose 1" in the text field. Don't hit Enter, or you'll have a carriage return in the label.
4) Go to the Triggers tab and Add Trigger.
5) Open the trigger properties, select the atom, select Pose Presets, then select LoadPresetWithPath.
6) Set the preset to the pose preset you previously saved.
You can move the first button to some convenient place in the scene. You can also change the color and Alpha of the button background, and text. Subsequent buttons can be aligned to the first one using the Move menu and Select Align to from scene. This puts one on top of the other. Then you just shift the second one in X or Y to move it relative to the first one. You can parent all the buttons to an Empty atom to move them around together.