Create a new project
Create a _new project _and click the plus icon in the upper left corner to select your robot or avatar:
Add an avatar frame/robot frame
You can add multiple robots or avatars to one project! Therefore click the plus icon again and choose another robot or avatar:
Add avatar/robot speech
Click the _Enter text for the robot to say _box and type in Hello World! 
Press Enter on your keyboard and click outside the window and save your changes (the procedure should be the same for all robots, although the start button may be different).
Save your changes
Please never forget to hit the Save button whenever you change anything, even when the system is automatically saving your progress from time to time.