首先使用用户名密码登录WordPress后台。
![](https://iknow-pic.cdn.bcebos.com/8326cffc1e178a82115106a6f803738da977e843?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)
在仪表盘控制界面选择外观选项卡,点击【编辑】选项。
![](https://iknow-pic.cdn.bcebos.com/3b87e950352ac65c16371f75f5f2b21193138a81?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)
在弹出的编辑界面的右边找到“style.css”文件并单击。
![](https://iknow-pic.cdn.bcebos.com/42a98226cffc1e172dd2f5374490f603738de943?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)
找到如下代码位置:
.primary-navigation {float: right;font-size: 14px;margin: 0 1px 0 -12px;padding: 0;text-transform: uppercase;}
将font-size修改为你希望的字体大小。
![](https://iknow-pic.cdn.bcebos.com/728da9773912b31b1f01b42f8818367adab4e143?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)
修改完成后点击【更新文件】按钮。
![](https://iknow-pic.cdn.bcebos.com/0eb30f2442a7d93358e89a75a34bd11373f00177?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)
查看网页顶部的菜单栏你会发现字体大小已经修改成功了。
![](https://iknow-pic.cdn.bcebos.com/8718367adab44aed9b23c7e2bd1c8701a18bfb43?x-bce-process=image/resize,m_lfit,w_600,h_800,limit_1)