King and priest for ever

Psalm 110
The Lord says to my lord:“Sit at my right hand until I make your enemies a footstool for your feet.”
Your troops will be willing on your day of battle. Arrayed in holy splendor, your young men will come to you like dew from the morning’s womb.
The Lord has sworn and will not change his mind: "You are a priest forever, in the order of Melchizedek.”
The Lord is at your right hand; he will crush kings on the day of his wrath.
This royal psalm speaks in such prophetic terms of the ideal, that it is seen as pointing to God's coming King: the Christ.
Verse 1 is quoted more often than any other Old Testament saying by the New Testament writers, who identify this King - the Messiah - with Jesus.
Why?
Jesus is the Lord, he is not came from priests of Allen but from the order of Melchizedek.
The people of Jesus will come like dew from the morning's womb, his follower are so many after Jesus resurrection from the dead.
Sit at God's right hand means Jesus has great power and authorizes over the world.
How?
Acknowledge that Jesus is the Lord and King.