To edit a tag
On the Tools and Resources tab, click on the Tags subtab link.
In the management pane, select the tag that you wish to edit.
Click Edit Tag . A dialog is displayed with the following fields:
Tag Name: Use this field to rename a tag.
Description: Use this field to provide or update the description for a tag.
Click OK to save the changes, or Cancel to exit out of the dialog without saving any changes.