You'd like to give God a chance and get to know him. Jesus, thank you for your gift of salvation. I'd like to get to know you personally, and begin a relationship with you right now. Please come into my life and begin to reveal yourself and your plan for me. There's no special method to saying the prayer.
Some people kneel.
Some people don't. Some say it out loud. Others say it silently. It's not really the words or the way you say it that counts, but the feeling behind it and the fact that you're doing it. Just know that however you said it, God heard it.