Radio Problems

Hello everyone, I’m a new owner of a Land Rover Freelander Facelift 2005 and when I bought it , does it come with no radio . So first I bought one that look like it’s should fit , I had 3 connectors and that one had also three holes for them . But was no working . I have the HK audio line . Now I bought a head unit , but still idk what kind of adapter I need . If you could help me I would be very grateful

You need to wire the amp feed on a purple/yellow wire to make the amp power up