Myield is simple, you deposit WMATIC into the Contract, it will then lend and borrow from AAVE to get your more WMATIC
Expect massive changes
I believe the smart contracts will undergo at least 2 major overhauls before any formal audit process, see roadmap below
Specify the amount you want to deposit and then confirm the transaction
You can use Wrap / Unwrap to swap between MATIC and WMATIC at no cost at any time
The Wrap function will allow you to swap all your MATIC into WMATIC (it will keep 1 MATIC to ensure you can pay gas for Txs)
Check deployed Contract:
https://explorer-mainnet.maticvigil.com/address/0x9dB2A331fbD4cEA56450f3A0a9b983bC52ec7387/contracts