After the example, I touch the letters with the mouse in yhe correct direction indicated in the example and nothing happens, I can´t start to play the game
You're clicking and dragging from the 1st letter to the last and then releasing the mouse, not just clicking the individual letters, right?
Here is how to do it:
Rich Text Editor.
To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph.
An inline formatting menu will show up when you select text. Hit tab to get into that menu.
Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.