New Tag

To start, go to Activities from the menu on the left and click on Tags. Once you’re on the tags list, you can create a new one by clicking the  button in the top-right corner.

The Name is mandatory to be filled in to add a new tag.

You can enter a Category to the new tag through the Category field.
Action: You can edit the tag name by clicking on the action drop down.

Add Related Information: The corresponding tag can be linked with different modules (Accounts/Leads/Contacts/Deals/Invoice/Quote/Product/Partner) through the button. As you can see in the screenshot above, this tag is currently linked to one record in the Accounts, Leads, Contacts, and Deals modules.
Select: You can tag more Accounts/Leads/Contacts/Deals by clicking on button.