Once a report template, document or package has been created the author of said asset may rename those items at any time.
From the left hand menu navigate to the Reports & Libraries > Libraries and then click on the Mine tab.
Click the Rename button of the asset to rename the item in question. You can also add a description that is searchable as well. All users who the item is shared with will see the updated name and description.
Once finished select the Update button and both the Name and the Description will be saved.