You get a notice that someone responded to your question -- hooray! You follow the link to the discussion and for some reason, there is no reply option.
Most likely, you are not logged in. The Tech Forums allow you to search and read content without logging in, but if you want to participate, make sure that you log in through the link at the upper right. We want to know who you are!
Note: If this is your first time trying to reply in the forums, you may be unable to because your profile is not yet complete. Click on your name in the upper right corner, go to Edit profile and privacy. Fill out your first and last name to complete your profile. (Even though you see your full name in the forums, other users will not unless you choose so through the Edit profile and privacy link.) Like I said, we want to know who you are -- nice to meet you!
-- megan_t, your Community Manager