Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Unfortunately what you are wanting to do is simply not possible.
This particular model does not have a built in duplexer unit, so it is not capable of printing double sided automatically.
On this model it s only available as a manual process, so you'd have to print one side, flip the paper, then print the other.
Since this is a new printer, if that is a feature you need, you'd be better off returning it and buying a different model.
The next model up does support duplexing, which is the 9330: http://amzn.to/2dxLOv3 and is only about $50 more, which is a worthwhile investment if you need to duplex frequently.
My apologies for the news, this is simply a limitation of the 9130 model.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service as this is the only way I am credited for my time. Hopefully I have earned 5 Stars but if not please let me know what I can do to ensure you are satisfied. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
Thank you, ***** ***** a nice day,
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