How do I say 'hello' to my boyfriend's dad?? ://?

I know this seems straight forward. however, I have been to my boyfriend's house before, his dad has never seen me, but he knows I'm a girl and knows I go out with his son. Anyway, he told my boyfriend (his son) "Nest time your friend comes to my house, tell her to say hi" (in a friendly way). So now I need help on what i should say and do. Mind you, he doesn't understand hard English.. only basic. x Thanks a million