Hover over the Dashboard button in the Toolbar and click Tags.
The Tags panel will appear.
Click on the Tag you want to edit.
Edit the properties of the Tag as desired.
You may edit the Tag's Name, Alias and Description.
The Alias is auto-generated from the Tag Name. For example, if you enter a Name of “Annual Dinner and Auction”, the Tag's Add-on will auto-generate an Alias of “annual-dinner-and-auction”. The Alias becomes the last part of the Tag's Page URL, or Web address. So if the website containing your Tag is at http://www.mywebsite.com and the Alias is annual-dinner-and-auction, the CMS would put it all together to create something like http://www.mywebsite.com/annual-dinner-and-auction.
If you want to edit the Alias, remember to only use letters, numbers, & hyphens.