How do is show the battery % on the start page of my luminar?
Start page? You mean the start screen? Battery is shown in the top right section of your screen. If you want to check the % pull down the notification center just a bit and you'll see the percentage.
Or you can download a battery saving app. Most of them display battery status on the live tile
If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See
this link for instructions on how to join Windows Central.