- Click "Tags" at the top of your deck library.
- Type in the name of your tag, and click "Add".
- Click the "Tags" icon underneath the deck tile of the deck you want to add a tag to.
- Select the tag you want to add to your deck.
Tip: From the Tags dropdown, you can click the colored tag icon to change the color of a tag, edit the tag name with the pencil icon, delete a tag, or select tags to filter by.