How do I use dub?

[Minas Mina via Digitalmars-d-learn]

Oh and another thing: The program compiles right now but I can't 
execute it because for some reason:
Failed to create a child process.
Cannot run program 
"/home/minas/Projects/eclipse_workspace/DTest/dtest" (in 
directory "/home/minas/Projects/eclipse_workspace/DTest"): 
error=13, Permission denied

Running from terminal yields the same error.