noob question (another one .... sad)

#1 http://docs.garagegames.com/torque-3d/official/content/documentation/Setup/Overview.html

#2 You use a compiler - get Visual Studio Express, open the solution file for the version you have, click on "Build" and select "Build Solution" from the menu.

Perhaps dig around on Microsoft's Visual Studio document site to learn more about using your compiler. Or perhaps this Google search on how do I compile a c++ program in visual studio 2012 could help.

#3 You don't need to add anything to the engine to have a jetpack feature in T3D -- it's already built-in.

#4 And how do i activate it?

#5 Exactly as described in your Jetjump thread.