Jesus made peace between Himself and man when He robed Himself in flesh and paid the penalty for our sins.

"And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven. And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled in the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight: if ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;" - Colossians 1:20-23

Jesus did His part by His death, burial, and resurrection to make peace with us. He gave His life for us.

We accept what He has done - suffering and dying for us, when we give our life to Him by repenting of our sins, being baptized in His name Jesus for the remission of our sins, and receiving the gift of His Spirit to live a holy and overcoming life.  This is our part in making our peace with Jesus.

"Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call." - Acts 2:37-39