Becoming a Christian is very easy. It simply means accepting Jesus as your personal Savior. You can do this by praying and simply talking to Him, asking Him to be your Savior. The key to becoming a Christian begins with recognizing how far fallen from God`s holiness mankind is (you included). You must recognize your own sin nature (the fact that you think wrong things at times and act wrongly). We are all sinners. That`s why Jesus died. He died to pay for our sins. To become a Christian - or be saved or "born again" (as some call it) - you simply tell Jesus you recognize you are a sinner and accept that He, Jesus, died for your sins. You receive His gift by asking Him to be your savior. That--and that alone--makes a person a Christian.If you truly let Jesus into your heart, He`ll then begin to change your life. You`ll learn more about Him as you read His Word, the Bible.
To become a Christian, you could pray a simple prayer something like this: "Lord Jesus, I know I`ve done wrong things and am a sinner. I know you died for my sins, and that you are God`s Son. Please come into my heart and be my Savior. Amen!"
Read more on becoming a Christian here.