You have to send an email to UNIC Dhaka with resume attached to be considered for internship. If they like you, they will inform you to schedule an interview. The interview will be in the UNIC office which is situated in the UN Offices, Dhaka in IDB Bhaban. UNIC's officer-in-charge will take the interview himself which typically takes about 15 mins starting with some chit chat about UN, the world etc. and then the interview questions. He will then take some more days time and finally send out an email about the decision.