For those that haven't accepted the truth in their life.
1. Admit to being a sinner and turn away from your sin
"For all have sinned, and come short of the glory of God;"
(Romans 3:23)
2. Believe that Jesus died for you and rose again
"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life."
(John 3:16)
3. Accept Jesus as the only way into Heaven
Jesus said: "I am the way, the truth, and the life: no man cometh unto the Father but by me." (John 14:6)
Talk to God in prayer and tell him that you understand that only by his grace (Jesus dying for you) will he accept a sinner like you. Promise him you will live your life according to his will from this day forward.