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I can't mark a question/discussion as "solved" and I can't mark any comments as "helpful".

Question asked by tkalberg on Feb 5, 2016
Latest reply on Feb 5, 2016 by tkalberg

I am new to the forums and recently I opened a discussion about an issue that I had. Someone was kind enough to help me out and I wanted to mark some of his comments has "helpful" and then the discussion/question as "solved" but none of those options appear anywhere for me to select. I have logged in using Explorer and Chrome but neither work. Why can't I mark these? Thanks.