Unless it's locked, which I doubt, you can do both of those things yourself.
But this tag looks like it should be disambiguated, so it could use some discussion first.
For starters, it looks like it's tagged mostly for a fan made personification of the sword rather than the sword itself, and is scarcely used aside from that with only 13 total posts. Danbooru doesn't often tag objects like these unless they're particularly prominent, and this one doesn't seem to be, so this tag could probably just be axed all together. If not, though, it should at least be masamune_(final_fantasy).