How to delete an email account...?

from T-Mobile t-zones? Feel like an idiot here. I've got an older Nokia phone (also a Razr) which both can access T-Mobile t-zones. I have two email accounts set up there, but one of them I cancelled a while ago because it was turning into a spambox. Anyway, I'd like to delete it off my t-zones, but I cannot find where to?!? (t-zones, not the phones built-in email function!)Of course T/M online help is no such thing.

Thanks....