To run the Comments - By Type report:
  1. Go to Analysis > Reports.
  2. From the Category drop-down, select Comments > Comments Reports.
  3. Select Run for the Comments - By Type report.
  4. Select your desired filter options.
  5. Click Generate Report.
  6. If you get this message in the results, make sure you have the Comments Manager role  .
To grant access to the Comments Manager role:
  1. Go to Core > Security > Roles. 
  2. Click on Comments Manager.
  3. Click on Members.
  4. Click Add.
  5. Search for the user.
  6. Click the double arrows '>>' to move them to Added Users.
  7. Click Save & Exit.
Alternatively you can clone the Comments Manager Role; see How do I create a clone of a role?