Using Reviewer

Hi,

I have created a file using captivate 9 and used the option Send for shared review. Incidentally, I sent it to myself and wanted to provide review comments on the crev file generated. The file was working just fine when viewed in reviewer. However, I realised that I wasn't able to delete a comment that I had provided earlier. Am able to click the circle box for comments, and it's not working when I click delete. Nor am able to see any button that helps in deleting the comment I provided.

Is there some permission that I need to define for myself so that I can delete the comments as I wish to? And let me know of the permissions I need to set for others too. Pls let me know.