Puntuado con 1 de 5 estrellas

I installed it but there isn't any button to add !

Esta valoración es de una versión anterior del complemento (1.1.0). 

Hi dede5e,

the button is not added automatically, but must be added manually to the button bar above the message pane - the one that contains the "reply" and "forward" buttons.

You can add it by right clicking on the toolbar and choosing "Customize".

Regards
Christoph