首先选择主题，找到主题文件编程器，找到footer.php，点击编程，然后加入以下代码
<!--canvas-nest show start-->
<script type="text/javascript" color="255,26,31" opacity='0.7' zIndex="-2" count="100"
src="https://cdn.bootcss.com/canvas-nest.js/1.0.1/canvas-nest.min.js"></script>
<!--canvas-nest show end-->点击保存即可