What to set for the variables in Gitlab CICD settings

I am referring to the guide
https://hub.docker.com/r/sonatype/gitlab-nexus-iq-pipeline

what should I setup in Gitlab CICD settigns?
NEXUS_CONTAINER_SCANNING_SCANNER_IMAGE ← is this the image Just build in the same gitlab CI pipeline?
NEXUS_CONTAINER_SCANNING_REGISTRY_URL ← please give example
NEXUS_CONTAINER_SCANNING_REGISTRY_USER ← sonatype lifecycle login user? or gitlab login user?
NEXUS_CONTAINER_SCANNING_REGISTRY_PASSWORD ← sonatype lifecycle login user? or gitlab login user?
NEXUS_CONTAINER_SCANNING_LICENSE ← we have license installed in sonatype lifecycle, what is this? please give example.