Governance at MakerDAO is done via onchain voting via https://vote.makerdao.com/
If you own MKR token, you can participate in governance resolutions (like inclusion of new Oracles) and executive voting (like vote in risk parameters for a newly accepted collateral type) affecting the crypto-backed DAI stablecoin system.
The setup is not easy because it requires to switch between cold and hot wallet several times, but very well explained from the guys @makerdao! You can actually trust the gas estimate at the start of the process - Metamask is showing much higher costs due to the maximum gas limit that is set very high but not used up.
The voting itself is pretty straight forward, but I am glad not to have to do the setup again, as all in all it takes you like 30 min with MM default gas price.