If the site you are working on has multiple pages, you can choose which page in the site is the home page (also known as the welcome page) for the site.
To select a page to be the home page, navigate to that page and switch to the Page ribbon. If you have sufficient permissions on the site, you see the Make Homepage button in the Page Actions section of the ribbon. To make the page the home page, click the Make Homepage button and confirm the action in the pop-up prompt that shows up.
Alternatively, in publishing sites, click the Welcome Page link in the Look and Feel section of the site. (Again, this option appears only in publishing sites.) This selection opens the Site Welcome Page setting page, which enables you to specify which page should be opened (see Figure 1). Simply type in the link or use the Browse button to browse to the page in the site that you want to be the home page.
我的方法是：
1.进入我的网站：https://sun
2.网站设置--新页面---输入欢迎页面
3.首先你要有管理员权限----点击上面的rabbion----页面-----制作主页（make home page)，成功。