You can apply defined and free-form tags to a model in Data Science.
- 
From the models page, select the name of the model. If you need help finding
                    the list of models, see Listing Models.
The model details page opens.
 
 - 
Select the Tags tab to view existing tags. You can
                    select the edit icon next to a tag to change its value or remove it. 
To add a tag, select Add tags, and then enter the tag
                        namespace (for a defined tag), key, and value. Then select Add
                            tags.