How to set up a single Tx-Rx pair using 10MHz bandwidth and QPSK in MATLAB Simulink?

Hello!

I have been working on this assignment for about a week but I am not able to start it. I found an example about QPSK Transmitter and Receiver in the Help Center of Mathworks (link: https://www.mathworks.com/help/comm/examples/qpsk-transmitter-and-receiver-1.html) but I am not sure about where to implement this "10MHz Bandwidth". Do I need to set a communication system simulation with antennas too inorder to address the above question? I seriously need help to get started. I need guidance as to how I can completely answer the given question.