To add an existing tag, click the drop down and select a tag. Or, type the name of your new tag and click + Add tag.
By default, your article will be set to Public access, which means the article is visible to everyone. You can select Private - registration required togive a specific list of contacts access to this article. The contacts will need to register and sign in with their own email and password to access this article.
In the upper right, click Publish to take your article live.