Click on post ->Tags
After click on the Tags link you get a page like this
Here you find two fields :
Name :It is the name of the Tags.
Slug :In tags the slug is used in the URL to display your tags.
Example : Suppose your tags name is “Office table” then the slug should be office-table.
Description :It is the brief description about the tags.
After fill all the data click on the Add New Tag Button