To delete a custom video metadata field, proceed as follows:
Highlight the entry you want to delete in the list of video metadata fields.
Then, click the [] button at the top of the list. A confirmation dialog box will open.
Confirm with the [Delete] button. A second dialog box will open, telling you in how many places the metadata field is currently in use.
If you still want to delete it, click [Delete]. The custom video metadata field is deleted.