'docker' is not recognized

I’m setting up Wappler on my computer and am getting an error with docker.
When I go to projects settings, Targets and click ‘Test connection’, I get the following error:

‘docker’ is not recognized as an internal or external command,
operable program or batch file.
Error Occurred Testing Docker Connection!

I did go through the setup process and it said it was installing docker.
Any idea what could be wrong, or what else I can post to get this figured out?
Thanks, Dan