Change/Remove tag for a map

[X-Minolta]

Hi everyone, yesterday i've published my map but only now i notice that i use a tag for something that probably doesn't exist in my map, in this case i've put the tag cliff since the map as some area where you can fall but now i don't think can be considerate cliff that parts. So my question is there is a way to change a tag or completely remove it? (I've looked everywhere in edits but can't find anything about it)