
it works. my engl. sucks but I try my best to explain.
go to your 'homepage', then 'I already read', on the right site you can see all your taggs. or just click on your manga wich you just tagged and click on the tag you want to delete. then you see all mangas with this unwanted tag. now its bothersome... you have to click on every manga and edit, erase the tag (on every manga) and dont forget to 'refresh' mangago. you can see everytime you delete/erase the tag the number is shrinking. sometimes it happends that you see a '0' on your unwanted tag. then just click on it. you will see there will be no manga- then refresh and its gone.

na not delete the manga. only the wrong tag. I just made a screenshot album. may it helps a bit better. http://www.mangago.zone/home/album/58481/
but I have to be honest first I also thought it doesnt work anymore. but it was bec. I was too impatient. even if you delete and refresh- it will still be there but after few minutes... suddenly its gone... and thanks! I am happy that you could understand me :)

I just tried again. for me it works. I will explain what I do: go to your homepage, then 'already read' - now you should see all your tags on the right site. click on the tag you want to delete. then you can see all mangas you tagged with the tag you want to delete. (now its a bit bothersome) below every manga you have your tags, also your summary and "edit" + "delete". click on edit and just erase your unwanted tag (click on it and it will disapear) then click "submit". then the former page appears again (remember all mangas with your unwanted tags) next manga and next. sometimes it needs a bit time for the last one. like you already erased the tag on the last one and on your list you can still see it. just give it some time (guess the programm just need some time) it works! it cant be that it only works for me and nobody else ╮( ̄▽ ̄)╭
I mean completely deleting it. I'm trying to organize my manga list, so I've tried taking it out of each manga and also deleting the manga itself but it is still somehow there. Is it a glitch, or it's just hopeless?