newsupernova/app/code/WeltPixel/Backend/etc/adminhtml/system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="weltpixel" translate="label" sortOrder="2000">
            <label>WetPixel</label>
        </tab>        
    </system>
</config>