I like to deaktivate 1 license from an old Raspi 3B.

Before I can do that, I have to rename my devices (because they all 3 have the same name ...) and the help-file says, I cannot reinstall pianoteq if its once deaktivated.

So I like to rename my R3b and then deaktivate this license to use it on a new R4B.

But I do not find the right location
(Note: if you want to rename your hardware, do this from the software under "Help > About > Update licence".)
because I use Pianoteq via Zynthian.

What can I do?