BallstonSpaKW

I have 2 questions: 1. Where would I ask a question about building techniques. I am looking for help on a lift arm bridge. 2. I am trying to contact a user who submitted a LEGO set in LDD as I have some corrections to his model, but as I am new I am not allowed to send him a message and my attempts on some of his other social media sites have gone unanswered - my requests may have been dismissed as SPAM. Any suggestions? Kevin