I want to add a html page on luci. please help me.
This request for help is a bit unspecific...
If you want to add an application for luci, then take a look here for examples...
If you want to add only a static html site, for example as banner for your captive portal, then simply place the html file inside /www on your device, for example:
echo test > /www/my_page.html
Then you can see this "test"-site in http(s)://ip-of-router/my_page.html
For anything other, you should consider to ask a better question...
atually i want to add a html form page on status section of LUCI
Drop a partial file into