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

هذا التعليق كان على إصدارة سابقة من هذه الإضافة (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