Add extra information @ Customer backend

Hi,

You can turn on the "Display view files" setting of the HikaShop configuration to know which view file is used to display which area of HikaShop. Then, go that page and you'll be able to easily see which view file you need to edit to add your custom field.
Then, edit it via the menu Display>Views, add your code and save. The modifications will be saved as a view override so you won't loose them when you update Hikashop in the future.
www.hikashop.com/support/documentation/1...-display.html#layout
This goes for that page, but it's the same for any area displayed by HikaShop on your website.