Which app did you download? The Vive/Viveport is a storefront to download content - although you could download content authoring tools like Gravity Sketch from it. For general purpose development you'll want to look into either Unity or Unreal Engine 4 - both of which are free to start. You can also use something like A-frame/webVR if you have background in web development.
To reach Viveport's customer service team, email email@example.com
To connect with a live support agent for hardware support, go to www.vive.com/support, click on "contact us" in the top righthand corner, and then opt to speak with a Live Chat agent David R
Technical Specialist - San Francisco, CA; Monday-Friday