you asked HOW DO I EDIT IT, not WHAT DO I EDIT
HOW ... use an editor
WHAT? there's some interesting "documentation" in the "docs" directory
read it, any further help I'm likely to give will quote those documents anyway
or perhaps someone else on this forum can take over installing DNAS v2 for you step by step
Better to remain silent and be thought a fool than to speak out and remove all doubt.