The dialogue balloon works in the project you provided. The problem is making it work in another project. For example, I already have Dialogue Manager installed as an addon. I can use the default one, but I need specific instructions on how to get the Speech Bubble Balloons to work. I'm a bit confused about what exactly I should move from your project to mine.
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I’ve updated the README in the projects to include some more information about how the project works (specifically the camera stuff for positioning the balloon anchors). Everybody’s game is different so without knowing anything about yours I can’t really give you specific instructions other than to tinker with the example until you understand what each bit does before trying to move it into your game.