Onboarding email signature users depends on if the users are using signatures for Desktop or Office 365, the SSO method and the fields of the User Profile. Using the correct settings this can be done without interaction from the user.
To better understand provisioning and onboarding of your users: https://support.templafy.com/hc/en-us/articles/360012428517-How-will-users-be-provisioned-and-onboarded-
The following flow diagram describes how users will be have Templafy signatures enabled:
For users to enable O365 signature themselves they go to the following link: https://TENANTNAME.templafy.com/email-signature-office365-onboarding-intro where TENANTNAME is replaced by your Templafy tenant.
For Templafy support enabling O365 signatures contact firstname.lastname@example.org
To enable O365 signatures by default: https://support.templafy.com/hc/en-us/articles/360007329398-Enable-email-signature-for-Office-365-to-new-users-by-default