Add new user for luci

I want to add new user to luci.

I followed the following steps:

But I can t find the following files to add the new user:

/usr/lib/lua/luci/controller/admin/index.lua
/usr/lib/lua/luci/controller/admin/servicectl.lua

Are these files removed from the last version of OpenWRT? or am I missing somehing?
How to add new user to luci with limited access to some pages

lua / luci is a moving target. Suggest U fgrep -r root, sysauth in /usr/lib/lua/luci and see how root access is currently set.

Then; post a "solved" update here.

...Bill

Please did you work out how to add users to luci? Thanks Chris.