Where do you enter new beta key

[niceum]

I get this error when trying to read a disc.

MakeMKV v1.9.2 win(x64-release) started
Using direct disc access mode
Evaluation period has expired, shareware functionality unavailable.
Failed to open disc

I know what the new beta key is (where to find it).

But, where do I enter it?

[Woodstock]

Click on Help, then Register. Paste key into box.

On Linux, it is done like this:

I'm running Debian, my key is working and located in ~/.MakeMKV/settings.conf

Looks like this :

app_Key = "<key_goes_here>"