Just write in your first night accommodation address. But I understand there may be a time when someone enters the country without an address to go to then perhaps write in to be arranged.
I am sure it is for purposes so that they can contact you in case of emergency. However on any occasion it is advisable to register with the British (or other country) Embassy on entry to Morocco. I do this as although I have a base with an extended family, I am always one end of the country or another so i keep register on arrival with the embassy in Rabat its only a phone call away for safety. I always keep my passport on me wherever (and in which ever country) i go so if i have accident I can easily be identified.
Hope i hahaven'trightened you - i have no fear of anything in Morocco most people are so friendly and helpful and I return frequently. Enjoy your stay.
Source(s):
Personal experiences