The method is as follows:

1. Open the iBacktuning homepage and register an account.

2. Log in to iBacktone and choose a suitable backtone package or a customized backtone package.

3. Send an electronic signature authorization letter to the candidate to obtain authorization. The candidate directly fills in the corresponding information on the mobile phone or PC and signs for authorization. After the candidate authorizes and submits information, the back-check officially begins. Check the status of this back-check in the account background.

4. After the back adjustment is completed, preview, download and manage the back adjustment report in your account.