Как удалить тег(и), даже если они используются в некоторых темах?

[putty (Derek Putnam)]

@pyc

Seems like it’s not possible?

Have you tried:

1. Clicking on the tag on the tag page.
2. Clicking the settings wrench
3. Delete Tag

@pyc

can tagging system be disabled

Yes. There is a Tagging enabled setting: