try to tell him/her face to face,that's the best one. avoid sms or e-mail.
just go tell him or tell her how you feel
the best time i recommend is in person and just be straight up,tell her how you feel
The only way to handle this situation is to actually tell the person how you feel. So go for it!
Tell the person how you feel
You will know by the way you feel towards the person and the way the other person makes you feel.
Whenever you feel it's the right time to tell that person, or when you get to know that person really well!
one thing you could say is, "listen i want you to know how i really feel about you".
Alone (just u and him) and in person
Tell her how you feel about it.
Just tell him in person how you feel - I realize it sounds easier said then done but it is that simple if you already know how you feel - it will come to you when you are ready to tell him.
Only you can tell by the way you feel and they way the person made you feel.
Be honest and tell the other person exactly how you feel!