With the modules you can make every Diary Record you want to create! The field is endless, just looks small. You just have to syncronize the "Create Diary"-Module with the group leader/s of your Mission and with the first task (I don´t know if this is needed, but if you do, it works for sure!). The rest is self-explanatory, just write, whatever you want ;) If you want a second diary entry, just sync a second module with the leader/s and the task/trigger when it should appear.
Sometimes it is bugged in multiplayer and not everybody can see it, but all in all it works fine ;)