How to use AS 34 Kormoran?

Hey comrades!
I just got the Tornado IDS Marineflieger and I got the Kormorans. How am I supposed to use them? I have never used any air to ground missiles and don’t understand how it works. I couldn’t lock onto any of the boats in the german test flight map and it didn’t work against ships in battle as well. The rockets don’t even warm up. What did I do wrong?