Student Codes are Student based items.
  1. Navigate to the Families menu.
  2. Select Manage Families from the drop-down.
  3. Click View Mode and select Student View.
  4. Select the student(s) you want to assign the code to.
  5. Click Select Action.
  6. Select Change Student Code from the drop-down.
  7. Select the Code. 
  8. Click Submit

Type Codes are Family based items.
  1. Navigate to the Families menu.
  2. Select Manage Families from the drop-down.
  3. Make sure that Family View is selected under View Mode.
  4. Select the family/-ies you want to assign the code to.
  5. Click Select Action.
  6. Select Change Type Code from the drop-down.
  7. Select the Code. 
  8. Click Submit.

If the desired code is not provided, you may need to create it. Please reference How Can I Create Student Codes or Type Codes