Thanks for the question. Your SMK9175ST should have come with all of the installation hardware, templates and instructions needed to attach the microwave to the cabinet above it and the wall behind it. If yours did not, please call 800-SAMSUNG to speak with an agent who will be happy to help.
The user manual and installation guide can be downloaded as pdf files from this website.
SMK9175ST User Manual: http://www.samsung.com/us/support/s...
Installation Guide: http://ars.samsung.com/customer/usa...
Please note that these instructions are the same for all Samsung over the range microwaves, including your SMK9175ST, though it is important to confirm the blower is angled appropriately for your desired venting.