how to add tags?

I used to be able to add tags by pressing enter and space, but now I can't (though it's been a while since I tried). It's a bit annoying seeing that '' tag everywhere in manhwas and mangas, it doesn't really affect reading so I don't really care. But now I found a new manga that I like with no tags at all and wanted to add some, that's when this problem really started bothering me. And this is my first time using the 'asking question' feature because I genuinely need help with this