Let me guess, you started or was asked to start a new process in the organisation because folks don't know why things are not going well and would like to do something.
People are not updating or moving items around because they don't see the value or the point in it. If you have an open minded team the only thing you can do is wait and patiently help them understand the idea and see how they react and what figure out what the smallest thing they can do etc. With the retrospectives and "lectures" you are going to drive them away from the new approach; they'll see it your or the management "newest" idea, and they'll wait until it is gone.
A quick help can be to ask them: "what would you do instead?" If it is not a far fetched idea, do it and check the result. With this approach you can introduce the team to the agile way of working (mind the small 'a'); trying out new things, reflecting the change, take responsibility of said change and revert if necessary.