How to properly use the MEAN.io token bundle

I am using MEAN.io to develop a project and I am trying to run a package with a symbolic token.

I have watched the main video from the Mean.io documentation where they explain superficially how to use it. Well, I added the "middle token" attribute to the html tag to make it editable, but the value shown is "0" (zero). And besides, although I can see the input text, I cannot write anything.

For example:

<h1 class="title" mean-token="profile-name">{{ character.name }} {{ character.surname }}</h1>

      

        
        
        
      

    

In theory, this h1 should show the values ​​from character.name and character.surname, but instead it just shows "0" (zero).

I went in /admin/tokens

to create a marker manually and then added its value {{character.name}} {{character.surname}}

as I saw in the video. But it doesn't work.

Where can I find additional (and better) documentation? Any suggestion?

Thank.