double opt in registration tutorial.
I am using the double opt in registration tutorial to add a 'Verify email' function to a form submission. The problem I have is understanding the section headed - 'Create the expire used random string functionality'. It does not explain what to put in the 'Trigger' settings for the update behaviour.
Do I use the same as the previous 'Update behaviour' which uses 'URL variable = id'
Thanks in advance!