i have the same assignment in school and i literally just put 
"Psalm: 
I. Address to God: 
II. Lament or Complaint: 
III. Confession of Confidence: 
IV. Petition: 
V. Words of Assurance: 
VI. Vow or Exclamation of Praise:Psalm: 
I. Address to God: 
II. Lament or Complaint: 
III. Confession of Confidence: 
IV. Petition: 
V. Words of Assurance: 
VI. Vow or Exclamation of Praise:"