Yes, you're absolutely right. What I posted in the picture didn't make the problem clearer. But I did find a way to resolve the issue. Maybe this will help someone else.

The issue is that vTiger would not show the Comments/Add Comment module in Leads or Contacts records for anyone in the hierarchy lower than the Support Profile. I could not give the Sales Profile the ability to make comments or even see the Comments field in the records. I had checked Sharing Access and the module Comments was fully Public so I crossed that off the list, then when I went to edit the Sales Profile to give them access. I saved the changes and found (repeatedly) that the changes didn't stick. The permissions route was where I was headed too, but found a post that identified the issue as a problem with a particular variable.

This is the fix that worked for me: Log into Webmin, go to Tools and with the text editor, edit php.ini:

Path: /etc/php5/apache2/php.ini  Find & uncomment, or add a line with: max_input_vars = 1500

Here is a link to the original post that I found my answer in. My solution was at the very bottom of the thread, but the problem is nicely shown right at the beginning. https://forums.vtiger.com/viewtopic.php?f=129&t=52564