Nemberala is in Nusa Tenggara.
You must get into Jakarta and Denpasar, and find domestic flight to Kupang airport (IATA= KOE)
From Kupang you can choose to continue with Airplane or Sea There is a daily ferry to the island from Kupang, the provincial capital on West Timor, which provides transport for local passengers and goods as well as tourists. The trip between Kupang and Ba'a takes around two hours. The ferry leaves at 8.30 AM and costs 80,000 IDR.
Wings Air operates daily flights between Rote's David Constantijn Saudale Airport (IATA RTI) and Kupang Airport (IATA KOE). Flight time is about 30 minutes.