Once you have your registry set up, you'll need to tag you images adding the registry address.

Supposing your docker-registry address is:

192.168.10.12:30500

and that your image name is:

xosproject/vsg-synchronizer

You'll need to re-tag the image as

192.168.10.12:30500/xosproject/vsg-synchronizer

NOTE: you can do that using the docker tag command:

docker tag xosproject/vsg-synchronizer:candidate 192.168.10.12:30500/xosproject/vsg-synchronizer:candidate