You will first need to set a new password via https://mysignins.microsoft.com/security-info/password/change. If you have forgotten your current password, you can reset it via https://accountreset.ugent.be/en.
Once you have changed your password, contact ICT HelpMe for more information about the block and how your account can be reactivated.
Note: A lockout caused by entering the incorrect password too many times will automatically be lifted after a certain period of time.