To access tags, go to your Tags page via the drop down menu at the upper right of your screen.
Start creating Tags by filling out the Tag name, description, any parent tags you want your new tag associated with, members of the tag, and the tag type.
Once you save your tag, you will be able to view it within the Tags menu. The following example displays 4 different tags, with one being a parent tag to the other 3.
A Parent Tag acts a connector to every tag it is a parent of. For example, the @all tag acts as a parent tag to the other three in the diagram. When you message @all, everyone associated with @backend, @customersupport, and @frontend will be messaged as well.
You can also issue tags to users by going to the "Users" page. Click the drop down arrow within the tags menu to select and issue the tag(s) to a specific user.
Once saved, whatever members are associated with that tag will receive messages whenever the tag is used. For example: User 1, 2, and 3 are all associated with the tag @devs. When user 4 messages "@devs", user 1, 2, and 3 will all receive the message.