Simply open up the app, select one of the identity providers, login, and you will have automatically proved your identity!
If you just want to test the attestation functionality you can also use our Demo Exchange, for more info how to use it go here
Users can link their identity to their cryptocurrency account, in order to prove their uniqueness to particular on-chain or off-chain applications. Currently, the only supported applications require you to link your identity to Ethereum addresses. You can link address with WalletConnect or by scanning a QR code. Please visit https://zkportal.io/sign_eth.html in order to generate a QR code to prove you own your Ethereum account. For this, you will need to have Metamask installed.