Go to the Assets tab from the top tabs of the selected workspace. From the list of assets select the one you want to add semantic tags to.
Figure 1 Select Asset
Click the icon from the top-right corner actions buttons to open the Semantic Tags popup.
Figure 2 Semantic Tags
In the New Category field, enter the category name for the semantic tag.
Figure 3 New Category
Click the button to add the semantic tag to the asset.
Figure 4 Add Button