Where's the docker terminal?

Hi there. Absolute beginner with docker. Downloaded Mac version (running 10.3.6) and upgraded to latest version which gave me an error:

Docker fatal error
one of the sub-processes failed: com.docker.driver.amd64-linux -addr fd:3 -debug (pid: 981)

I reset to factory defaults and now it launches…
Anyway, even before that I was simply unable to find the docker terminal window, so I’m unable to type anything at all. Any way to bring up that window ?
Sorry for my ignorance…