In order for your trainer to be able to monitor your training progress, you must provide them access to your record of operative data. This is achieved by going into the security area of the logbook, selecting Trainer Access and then entering the surname of your trainer in the search box.
If your trainer already has an account their name will appear on the search results list of users. If you are setting up a password for your trainer to validate your records you should use something different to your account password. At the end of your attachment you can remove their name from the list.
Instructions on how to grant your trainer access are here.