Hi
I would like to transform this armure :
to this one :
I don’t understand how … 
Or do you mean the key signature? Press shift-K, type ‘F’ (or ‘d’), then enter. Or find the key signature panel in the right hand side of the Dorico window.
Edit: armure is indeed the French word for key signature.
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yes for armure 
I just tried but it doesn’t modify the signature key which rest like first screenshot …
And when I go to the right panel it modify the notes but not the key signature …
Maybe I was a bit too concise:
• first, select something at the beginning of your score (for example, the first note or the time signature)
• open the panel marked ## on the right edge of the window
• open the sub-panel for Key Signatures (might be called Arm[at]ure in your version of Dorico)
• choose Major or Minor and use the up/down arrows to select the number of sharps/flats
• then click on the key signature itself: this will insert it at the beginning of the piece.
(Of course, you can also enter a key signature change in the middle of your piece, by selecting something elsewhere.)
The alternative (and much faster) method is:
• select something at the location you want the key signature
• type shift-K (also in French)
• this will show a small popover window; now type ‘F’ for F major (or ‘d’ for d minor if that’s what you need), and press Enter. Dorico will insert a key signature of 1 flat.
French manual for panel
French manual for popover
Et enfin, je voudrais remarquer que c’est pas grave de poser des questions en français, surtout si la terminologie anglaise vous échappe une fois. Il y a aussi beaucoup d’utilisateurs francophones sur ce forum. Peut-être faites accompagner votre question d’une traduction automatique en anglais.
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ho yes , thank you Shift-K + d was OK for me , a big thank you 
Si vous utilisez FB, vous serez le bienvenu sur le groupe francophone des utilisateurs de Dorico