Tags are a new feature in EndNote 21 and provide an extra option for organising and classifying your references. Coloured tags can be added to references as a visual label to quickly and intuitively identify references in your library under a collective heading. You can attach multiple tags to references, customise the colour and name of the tags, and add and remove tags as you require.
To create a tag, click on the + sign next to My Tags in the left hand menu.
Select a colour and name your tag.
To add tags to your references, when you select an individual reference you will see a Manage tags button in the Summary pane on the right.
Click on the Manage tags button to add tags you have created to the reference.
You can view tagged items together (like Groups) under My Tags in the menu on the right.
Tags will also appear alongside the titles in your list of references.