When you're in your Scene. Place an object or a character somewhere in it.
After you have placed the object, you will see a new window on the right side with information about the object. In this window, there will be a button called Add dialogue. Click this button.
You have now opened the Dialogue editor. To start creating a new dialogue, click the button on the top called Add new dialogue tree. You should see a blue box appearing.
This blue box indicates the non-playable character (NPC) dialogue. Write something here that you want to be said to the player. To save this, click the Apply and Exit button in the top left corner.
Remember to save the Scene as often as possible! Click the Save changes button on the top bar in Creator.
Now if you click Play, the game will start and you should see the dialogue you created appearing at the bottom of the screen with the text.
After this, the game will end, and you can click Restart to play again or Quit to go back to editing the scene. Next, click the object you placed in the scene and now click the button in the window to the right called Edit dialogues, now you should be back to where you were when editing before. To add a player answer you can click the little plus (+) sign to the right in the blue box.
and then choose Add Player dialogue. This will add a yellow box to the dialogue tree.
If you want the player to have multiple things to choose from, you can click the same button again on the blue dialogue box and add another player dialogue. Like this:
You can also make something happen with these choices by using actions! Try clicking on the plus (+) sign on the player dialogue (yellow box) and Add new action.
A red box should appear under the player dialogue box. This is an Action.
Actions are where you can make things happen. You can move things, make things invisible, add/remove points from goals, and store values for later use.
You can also make Conditions, these are green boxes that contains conditions you set that has to be met for the dialogue under to be executed. Here is an example:
What this does is give you a choice based on if the object this dialogue is attached to is visible or hidden. If the object is visible, you can only select Choice 1 (hides the object, choice 2 here is not visible to the player). If the object is hidden, you can only select Choice 2 (shows the object).
When you're done you can click Apply and Exit in the top left to exit the Dialogue Editor and then remember to Save Changes in the top bar to save the current state of your game.