By default, Loki is enabled and configured for Monolithic mode.  It should, by default, also create storage for it.  The instructions on how to do this are actually given in the Network Observability Operator when you install it.

oc create namespace netobserv
oc apply -f <(curl -L https://raw.githubusercontent.com/netobserv/documents/5410e65b8e05aaabd1244a9524cfedd8ac8c56b5/examples/zero-click-loki/1-storage.yaml) -n netobserv
oc apply -f <(curl -L https://raw.githubusercontent.com/netobserv/documents/5410e65b8e05aaabd1244a9524cfedd8ac8c56b5/examples/zero-click-loki/2-loki.yaml) -n netobserv

By doing this, you can create a FlowCollector instance by simply clicking "Create FlowCollector" and then the "Create" button!  It won't require you to go outside of OpenShift web console to issue these commands and to have `oc` installed.