How to configure mac book pro to act as an Access Point (and not a router)?
Just replace the word router with your Mac.


  If you are living in student accommodation and you would like to use a
  router (in your case the MBP), then you must follow the below
  instructions to ensure it is correctly configured for use on our
  network. Using a router that performs the DHCP service is against our
  terms of use. Failure to disable the DHCP service of your router may
  result in your connection being suspended.
  
  If you are living in residential accommodation, your router does not
  need to be re-configured. Please see our FAQs for more information.
  
  1) Connect the power cable to your router, and connect your router to
  your PC using an Ethernet cable. This cable needs to go from one of
  the LAN ports on the router into an Ethernet port on your PC. Please
  see the diagram below.


Follow additional instructions here