Adding labels to dataset in BigQuery

Unfortunately, no–I don’t have any clue why.  What do you see and what have you already tried?  Are you getting any error message when you try to add it?  How does it behave?  Can you type it in but it just doesn’t save?  Have you tried refreshing the page and trying again to add another label?  Can you edit the labels to add one, instead of at create-time?