Tell him you like him; that should be enough. More subtle things include asking his opinion on things you are thinking about and spending time with him.
You have to show him you like him.
I'm a guy and I say that you should talk to this guy, figure out what he likes and then show him that you like/can like the same things too.
Being a guy myself, and having delt with this quite a few times, you have to give the guy you like, signals, to show you like him.
From your heart
Be yourself. Show her that sometimes you can really be that nice guy.
Show him you like him, it is the only way. I know I like girls that show me they like me... that's how they get my attention. If he is a boob guy, show cleavage, and if he is a butt guy, flaunt that rear end girl.
text him everyday
Nick Zano
"show him" why you are better than her.
If you like a guy, throw him hints. talk to him more often, play around like jokes and show genuine interest in them
He doesn't say or show any signs
Don't be afraid to tell him that you like him