If you send the email you can use this action in a page (client side) or in a backend workflow (server side).
If you select “Just create link, don’t send email” then you need to use this action in a backend workflow and the link can be used in subsequent actions in the same backend workflow.
If you need to trigger this logic from a page then you need to schedule a backend workflow where the actual logic will execute.
I hope it’s more clear.
Cheers
Mariano