German phrase
Ich habe ~ eingetragen.
Meaning
I've added ___ to my calendar
When to use it
It means you added an event. It is used for appointments and other scheduled plans.
Example dialogue
Können wir uns am Freitag um 15 Uhr treffen?
Can we meet at 3 p.m. on Friday?
Ich habe den Termin am Freitag um 15 Uhr eingetragen.
I've added the appointment for Friday at 3 p.m. to my calendar.