I asked a question on ServerFault (where I am not registered), and it was migrated to SuperUser. Now I want to accept the closest-to-true answer I got, but I can't -- it does not belong to my SuperUser account. I don't have enough SU reputation to even ask this meta question on meta.su.com (I did get 2 points for editing my question).
There is a question here that seems exactly about the same situation ( Accepting an answer on a migrated question) but I don't see how to apply the answer. In detail, I don't see any option to "flag" a question or to "associate" accounts (I've used the same email address in pre-registration questions and answers, and in registration using StackExchange OpenID; are the accounts already associated?).
My (original) question is http://serverfault.com/questions/368634/how-to-fix-very-high-w-await-on-linux-desktop?noredirect=1