As instructor I use different type or different registration,  would be possible to read the aircraft registration of each flight on the LOG summary ?
regards,
Gianni‌

We do allow free-text entry in the logs, you can put aircraft registrations in there if you wish.

Where ? In the Pilot Log before take-off or in the Log after landing ?
‌How to do this ? I could not find it  in the iPad version 3.8.1.72

‌‌

When you open a log and scroll down there is a Notepad section where free text may be entered.

I found it, ..... :-))
Could you consider to add automatically on the Log, the ID of the chosen aircraft on setup ?  Would be more easy to choose what to print from the summary... 

‌Another question‌:
I like the "Sky‌Demon Plate" on the airport tab, would be possible to edit it and to add tel n., or other personal info ?

regards,
Gianni‌‌‌

We deliberately do not automatically add aircraft details in there because people often fly routes with a different aircraft or the wrong aircraft profile.

No, we have no provision to allow user editing or addition of/to SkyDemon‌‌ aeronautical data.