I have two CR1000s in a LAN which is connected to the internet via a router. Could someone show me how to access each CR1000 from the internet using LoggerNet?
You need a public, routable IP port. This video gives an overview.
https://www.campbellsci.com/videos/ip-networking-2
If unable to make changes to the network for security reasons, one option is a paid router service.
https://www.campbellsci.com/pbrouter