In order to use the follow up/ or have any information within the follow-up tab, you must go into a job and select the 'notes' within the workshop job itself.
As shown in the image below,
PLEASE NOTE - A date and time must be entered.
This is then going to sit in the 'Follow-Ups' as shown below (on the bottom of the main service reception screen- where the job tiles are).
To Action - you must go into the follow-ups and double click the preferred line.