Hi Maureen,
qRules should allow you to do this quite easily.
In your rules, there is probably a sequence of actions, one of which is the action that sets the value of the Command node in the qRules 2DS.
When the command node is set to a Command, that command is executed. You probably know that by now.
The thing is: there are three additional fields in that qRules 2DS which will help you achieve what you've described. These are called "Success", "Error" and "Result".
The simplest suggestion I could make is to add an action that displays a dialog box message. You could have two of these rules, one for each of the possibilities:
(a) When Success=TRUE
(b) When Success=FALSE
You can display these three fields in your canvas, try out the form, and see what their values are after the command executes. This will allow you to set further rules/actions depending on the success or failure of the command.
If you need more help let us know. Good luck!