You will need to know a few things:
Your College Username is your student number which is in the format: stu-999999
Your College Password is the same password you use to get onto a PC in the college.
Your College Email Address is in the format: stu-999999@suffolk.ac.uk
You will need to set up multifactor authentication. Please see this guide for more information.
Go to https://www.microsoft.com/en-gb/microsoft-365/outlook/log-in
Log in with your College Username and College Password