Normally there is a box below the answer "select as best ". But its not a problem if you cant I just hope you got the answers you needed

James, that happened to me once. Never did get to choose a best answer. But if you get it figured out, You can choose more than one best answer by opening multiple windows of your question at the same time. Choose a different 'best answer' in each window. Just make sure you open each window before choosing a correct answer.