I have a report that lists all tasks completed by a specific user. I am trying to redefine the user from an employee that left to a new employee. How do I do this?

That depends on how the report was designed. The best thing is to either post the report here (upload it to a website and link to it here) so we can look at it and share the knowledge with other users, or you can contact our support team by follow. It should be an easy change, but the report needs to be looked it in order to know "where" the specific user is designated.

Cheers,

The support team can be reached at: support@marketcircle.com