1. Log In: Go to the FlClash website, sign up for an account, and sign in using your credentials.

2. Check Account Status: After signing in, check your account status. Ensure your account is active by verifying the status.

3. Update Account: Click on the "Update" button, which will open a modal. Save the update by pressing "OK" multiple times. This process should work successfully after a short delay.

4. Confirm Update: When prompted, press "OK" to confirm the update. The account name and credentials will change.

5. Contact Support: If the update doesn't work or if your account is expired, contact support. However, note that the old account may have expired.

6. Log In Again: After updating, log in to your new account.

7. Use the New Account: Now, you can use your updated account name and credentials with your FlClash account.

By following these steps, you should have a new FlClash account, though your old account will be inactive.