Can't add tag name that is within another tag name

When you say ‘right click’, you are talking about a desktop screen, yes? I don’t have the same view (and so, not the same available functions) that you refer to in yourvidclip (and echoed steps). This is what my view looks like when I select items and right click, so I cannot perform steps 4 onwards. If I create a new dummy name, and add/remove tags from the card, it leaves my ‘tag list’ with tag names I don’t want or use. I’d like to get rid of them from the tag list, not just the card.