To buy DUO, you can go BitMax / DDEX exchange:
1. Open Trust Wallet app, Click "Browser"
2. Type weblink "duo.ac", enter "Search"
3. Click "Approve DUO" (you only need to approve once during 1st time of staking)
4. Choose preferred node (e.g. Azure), enter desired staking amount (at least 300 DUO, e.g. 500)
5. Click "Stake"
Feel free to stake more by repeating step 4-5
6. Staking award will be distributed every working day. Awards can be claimed anytime (unclaimed award will be securely accumulated on the smart contract)
7. To unstake, click "Unstake" (if you have multiple stakes on the same node, the earlier stake will be returned on each request)