# who has taken pleasure in you, who placed you on his throne

"because he is pleased with you and placed you on his throne" 

# who placed you on his throne, to be king for Yahweh your God

"who gave you authority to rule as he does, to represent Yahweh your God as king" 

# in order to establish them forever

"in order to help them forever" or"in order to make them a nation forever" 

# for you to do justice and righteousness

"for you to rule fairly and righteously" or "for you to do what is just and right"