You can change your Gurobi User Portal password by logging into https://portal.gurobi.com/iam/home and navigating to Account Information -> Change your password. You will be asked for your original password.
If you forgot your password and cannot log in, please enter your e-mail address at https://portal.gurobi.com/iam/reset_password/. If you have an account, we will send a message with a verification code that will allow you to reset your password.