how to use BT-W4 on raspberry pi 3

[Phil35]

Hi,

Currently used is "Raspberry Pi 3 Model B Rev 1.2" with bullseye with
    onboard bluetooth  connected to WTX-700
   and of course the latest version of moodeaudio software 8.3.3-1

My goal is to:
- turn off  the onboard bluetooth  or  at least not use it,
- use the BT-W4 usb key received this morning, to connect to WTX-700

I don't know on the moodle menu (http://192.168.6.xxx/blu-config.php)  how to choose the onboard or the bluetooth USB key BT-W4. There is no choice. May be it is not possible?

Any help will be greathly appreciated
Phil

PS: I tried to follow https://di-marco.net/blog/it/2020-04-18-...pberry_pi/
      however the moode menu ( (http://192.168.6.xxx/blu-config.php) do not display anything, so back to previous moode webpage.