These are other applications from MakerDAO.
Maker Governance. This is a voting system as MKR token to be used as voting power.
(I am using ledger HW and choose "Ledger legacy", you can also choose Metamask etc)
These are how to connect with ledger
This is how much GAS costs for each execution at the time of writing.
0.00021864 ETH = $0.03 USD
I skipped this below as I don't have MKR.
This is what it looks like now. I will go through each tab.
Executive: Important proposal such as governance. You can't vote without MKR.
Polling: Other proposals.
I managed to vote without MKR.
Module: Kill switch in case of emergency which requires 50,000 MKR to burn
(Total circulation, 1,005,949 according to coinmarketcap.com). This is possible if MKR isn't decenterized enough? I don't see the point though other than wasting money.
Voting contract: To lock MKR in the voting contract
I will need to get MKR and lock here to vote on executive governance vote.
This is to upgrade SAI to DAI. You have nothing to do if you don't have SAI.
You will need to upgrade in case of future change.
3: SAI CDP Portal
You do not need to do anything here. This is for someone previously collateralize SAI and need to upgrade to DAI.
Information about SAI and DAI: