I have installed openhab in my raspberrypi 3 I need a different user interface

I have installed openhab ,I need basic User Interface, But I got PAPER UI,HABPANEL!! how to get basic UI
please help me out!!

Paper ui > extensions >user interface> basic ui install

I cannot find extensions option!! I have only control,Inbox,configuration,Addons,Rules,Preferences in the left corner…Please give me any other solution

Extensions was renamed Add-ons in more recent builds.

In extensions I cannot find Basic UI

Addons -----> User interfaces -------> Basic UI (Install)