If you have added a tag in error, or need to replace tags that were embedded in the assets prior to upload, follow these steps.
Remove a Tag from an Individual Asset
Locate the asset.
Click on the asset to preview it.
Click the small ‘x’ next to the tag to remove.
Bulk Remove Tags
Select your assets.
Click More Actions in the toolbar at the top.
Select Bulk Update Meta from the dropdown menu.
Enter the undesired tags into the Remove Tags section, pressing Enter between each tag so that it turns blue.
Click Update.