That's what you do!
Believe in Him!
The Bible says it best (you see some guy holding up this sign at football games and baseball games and all over the place!). Its John 3:16;
For God so loved the world, that He gave His Only Son, that whoever believes in him should not perish, but have eternal life.
How do you get to heaven?
Believe in Jesus.
Well, repent and believe!
First admit that you have sinned. Admit that you have gone your own way, and come back to God. Ask God for forgiveness. Repent means to turn from your own way, and turn back to God.
And then Believe that Jesus died for your sins.
And God promises that if you do that, He will do an amazing thing in you. He will put a new spirit in you - you will be reborn! Your body is still going to die one day, but because your spirit has been reborn, you will live with God forever.
Ice cream and cake every day!
Well.... maybe not. But it will be even MORE AMAZING than that!!!
(In fact, the Bible says it is going to be SO amazing, we can't even imagine it!)