Gidday Kevin, [#welcome] to the forum.
Under your “Manage Profile/ Community Settings” box on the right hand side you will see the “Search Community” box. It can be very frustrating to use but can open a treasure trove of information if you’re holding your mouth right, [:P] but don’t be afraid to ask.
Here’s a couple of links to n2mopac helix and layout posts, Ron is doing a great job.
http://cs.trains.com/mrr/f/11/p/202645/2214937.aspx#2214937
http://cs.trains.com/mrr/f/88/t/204099.aspx?sort=ASC&pi314=1
Have Fun, Cheers, the Bear.