After you select Journeys tab below insights ,moving forward select Create new tab as shown below, you will come across a box asking for the journey name and its trigger time,
You can give your journey a Specific name and the Event Triggers for it to appear can be set as
On the joining date: journeys can be made to trigger anytime before or after joining date
On specific date : Specific date on which the journey can occur.
When criteria matches: when journeys are made to trigger for specific group of employees
Know more about journeys in the next sections....