Use your FTP program (something like FileZilla) and navigate to /plugins/system/IsRequiredVmCustom

    Edit the file: IsRequiredVmCustom.php
    Search for “Select an option

    It will located on/ or around Line 39
    $matches[1] = implode('<option value="">Select an option</option><option', explode('<option', $matches[1], 2));

    You can change the wording “Select an option” to anything you would like and oit will be displayed on the frontend.

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