Qubes os and virtual keyboard

Hello,
I’m have a disability and I used Qubes a few years ago. I would like to use it again but I don’t remember the command to install florence as a virtual keyboard.
Thanks

You install package in to dom0 using:
qubes-update-dom0

So in this case you want:
sudo qubes-update-dom0 florence

Other keyboards are available: kvkbd is very nice.