Possibly related to this admin option:
can't mark others' answers as "correct answer" ?
i can mark my OWN replies as the correct answer, but when someone answers a question that i have, why can i not mark THEIR answer as the correct one?
okay i see there's a bug on this already
but it seems nobody is working on it?
aaaaaaand i see that here i can't even mark my OWN post a the correct answer??!
Right now I don't believe this functionality exists for the plugin. However you can definitely post a reply to that issue to show your interest in it Then when the issue gets closed you will be notified.