There the tag, for example, "lyfa" should be "leafa" (Sword Art Online). Such as this. I do not think to change the tags one by one for all the 49 pics is a appropriate way. How can I update it for all pics with the incorrect tag?

basically you can only change them one by one, but mods can make alias tag and then the old one would be transfered to new one automatically.

So if you have any more requests of changing tag later, just make a comment or forum post like this, mod will check and do it for you (I will do lyfa/leafa soon).