Setting Low Disk Space - Warnings

I am interested in changing the default levels for warning in Backup Exec 2012, such as Low Disk Space warnings, etc.  Here is the article I am following to try and change the default warnings:

 http://www.symantec.com/business/support/index?page=content&id=TECH189217

However, when I select the RD1000 disk we are using, the options to adjust the default warning thresholds are not there.....that block of settings is not there.  Are they located somewhere else?