In the LWF DPos system, each delegate would receive 5 LWF coins for every new block they forge on the network. If within the block, the delegate processes a number of transactions, they would also receive transaction fees in addition. These cover for the operating costs of maintaining their MainNet servers.
It is quite interesting also here is another detailed installation guide on how to join testnet for LWF https://medium.com/@jamie_52516/lwf-io-node-installation-guide-testnet-4bf3c62d4381 but before this guide you must setup server if you haven't, heres guide for it https://medium.com/@oxycoin/oxycoin-io-initial-server-preparation-guide-16e25a15bcad