Please be sure to read over the communication you receive in the mail from the Office of Retirement Services regarding your MPSERS account. They have a SMALL STEPS campaign going on right now where you will automatically contribute an additional 1% each year until you reach a maximum of 10% in your defined contribution accounts starting January 2017. If you are not interested in participating, you will have to actively contact them to opt out. The correspondence you receive will have your username and authentication code, along with the web address.
Customer Service for MPSERS is 1-800-381-5111.