This is the 326th most frequent German word.
melden
"To report" or "to announce."
The word 'anmelden' here means 'to register' or 'to enroll'.
Ich möchte mich für den Kurs anmelden.
I would like to register for the course.
In this instance, 'melden' means 'to get in touch' or 'to signal one's arrival, generally to another person'.
Bitte melde dich, wenn du ankommst.
Please contact me when you arrive.
The verb 'melden' in this context is used to indicate 'reporting' or 'informing' an authority.