两个不同环境的路径：
1.Salesforce Classic: Setup - Company Profile - Company Information
2.Lightning Experience: Gear icon - Setup - Company Settings - Company Information
以Salesforce Classic示例：
①点击Set up
②左侧菜单选择Company Profile-Company Information
③打开的Company Information页面上就能看到Instance信息了
参考资料：
https://help.salesforce.com/articleView?id=000322728&language=en_US&type=1&mode=1