Kiel

You will arrive at Ostuferhafen ferry terminal in Kiel :

...coming from the direction of Hamburg
Drive towards Flensburg via highway A7. At the highway triangle Bordesholm, from A7 head towards A215 Blumenthal/Kiel. Follow the road signs for Ostuferhafen/Klaipėda to exit highway A215. From this point on, follow the road signs.

...coming from the direction of Flensburg
Drive towards Hamburg via highway A7. At the highway crossroad Rendsburg, from A7 head towards A210 Kiel/Bredenbek. At the highway crossroad Kiel-West, turn from A210 towards A215. Follow the road signs of Ostuferhafen/Klaipėda to exit highway A215. From this point on, follow the road signs.

...if you take German railway
Head for the central railway station in Kiel, take the bus No. 11 going toward Dietrichsdorf and get off at the Grenzstrasse bus stop. You can then take a taxi from the central station to Ostuferhafen for approximately 12.00 Euro.

Bus timetable from the Kiel railway station to the port. 
Bus timetable from the Kiel port to the railway station 

Train timetable Kiel - Hamburg
Train timetable Hamburg - Kiel