# Authenticate / Unauthenticate

### Step 1 - Configure FCL

```javascript
import * as fcl from "@blocto/fcl";

fcl.config({
  "accessNode.api": "https://rest-testnet.onflow.org", // connect to Flow testnet
  "discovery.wallet": `https://wallet-v2-dev.blocto.app/-/flow/authn` // use Blocto testnet wallet
});
```

Alternatively, if you already have user's email and would like to pre-fill it for user's Blocto account, you can use the custom `discovery.wallet` URL instead:

```javascript
import * as fcl from "@blocto/fcl";

const USER_EMAIL = "client@email.com";

fcl.config({
  "accessNode.api": "https://rest-testnet.onflow.org", // connect to Flow testnet
  "discovery.wallet": `https://wallet-v2-dev.blocto.app/-/flow/authn/${USER_EMAIL}` // use Blocto testnet wallet
});
```

### Step 2 - Authenticate

```javascript
import * as fcl from "@blocto/fcl";

// fires everytime account connection status updates
fcl.currentUser().subscribe(console.log);

// authenticate
fcl.authenticate();
```

### Step 3 - Unauthenticate

```javascript
import * as fcl from "@blocto/fcl";

// fires everytime account connection status updates
fcl.currentUser().subscribe(console.log);

// unauthenticate and clear account info in FCL
fcl.unauthenticate();
```

{% embed url="<https://codesandbox.io/s/flow-autenticate-unauthenticate-v2-hfq56w>" %}