Add some attributes in the <a class="variations-add-attributes-link" href="{bbackup_94402fb9ba80f392e0976ece85f92b2b876bfcaed8d83250cc06083f7139c7d9}1$s">Attributes</a> tab to generate variations. Make sure to check the <b>Used for variations</b> box. <a class="variations-learn-more-link" href="{bbackup_94402fb9ba80f392e0976ece85f92b2b876bfcaed8d83250cc06083f7139c7d9}2$s" target="_blank" rel="noreferrer">Learn more</a>