Create an account on Rinkeby Network. Use MetaMask for it.
Get test ETH on Rinkeby Faucet
Follow the link and register
Press the BUTTON
You know the source code, find it a vulnerability. Use a test environment for this, we recommend such tools, such as Remix IDE or Truffle Framework + Ganache.
In order for the solution to be considered, you need to cause a vulnerability in the address you receive after clicking the button in p. 3.
We advise you to do this via Remix IDE using MetaMask (At address - call the function and pass the received address there)
Once you have done the necessary operations with the contract on the network, click on the button
The results can be found in the Leaderboard