Question on coding npc for 5165

When I do this step, Now to add the NPC go to NPCDialog.cs and add this:

Code:
#region FrozenGrotto


case 100001:
{
blah blah blah, do I copy and paste the code at the end? Or anything specific I need to add?

add the code before default:

So I need to just look for the word default and paste it there?
Sorry, the only way I can ever learn is to either see someone do it, or do it myself. I read every guide I can, but nothing makes sense atm.

Yes, look for