2steps :
 
1. Select text or image which will host the link
2. Activate hypertext link toward your document clicking on button  Insérez un fichier .
In the pop-up window, select your document with "parcourir", select your document then click on "charger" to validate your choice and insert the document.



To delete the link, select text or image then click on the button "supprimer le lien"