From the My Users menu, you have the option to invite your collaborators by email to modify their personal information.
The invitation contains the download link of the Signitic desktop application (MacOs).
Note: This invitation is not necessary to update the signature except for Apple Mail users under MacOS.
Go to the My Users menu, from the left side menu of the home page, then select your users using the checkboxes to the left of each user or sort them with the filters available at the top of the page.
Then click on the Invite button in the grouped actions bar.
You will be able to choose the language of the email and confirm to send the invitation.