As of August 5th, 2020, Defi Money Market: Governance officially released the Dashboard (MVP) at:
https://dao.defimoneymarket.com/governance/proposals
Though information on how to vote has yet to be released, it is expected to be in the near term considering the DMM Co-founders Gregory Keough and Corey Caplan will be speaking on a panel at the Global DeFi Summit on August 6th, 2020.
Furthermore, within the official DMM Telegram group, Zachary Rynes, a member of the DMM Foundation had the following to say up the initial launch of the DAO dashboard:

The aforementioned vote is illustrated below and linked here on EtherScan (Initially proposed at 5:51am EST and Cancelled at 4:20pm EST Aug 5,2020):


For more information regarding DMM: Governance and DeFi, I recommend you visit https://defimoneymarket.com/ and earn 6.25% on ETH, DAI and USDC all backed by real world income generating assets.
Tune in and register for FREE on August 6th, 8am PDT Online for the Global Defi Summit at https://globaldefisummit.com/ . Pick up some DMG at OKEx MXC or Uniswap today, and join the sprawling governing community.