Tags or subject labels are a new feature to VSNS Lemon 4 but not to blogging. Subject tags allow you to group articles that share a comment subject; in particular, they complement or replace categories.
Tags can be added or deleted while creating or editing an article under the Subject tags field. Separate each tag with a comma, e.g.: blog, VSNS Lemon, PHP scripts.
An article's tags appear below the article content. Clicking a tag displays all articles filed under that tag.
If you do not wish to use the tag feature, you can disable it under the Article Options. Set Disable tags? to No.