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Running a super node, pretty much having enough XEM to show you support the coin, and then turning your computer into a super node for the NEM network.
From their site. https://nem.io/investors/supernode-program/
Supernodes are high performance blockchain nodes which form the backbone of the NEM blockchain network. Accounts with 3,000,000 or more XEM can operate a supernode, either from a local computer or from a cloud-hosted server. Supernodes are required to be up and running 24 hours per day, processing all transactions.The NEM network has two layers. The supernode layer keeps the system powerful and fast, whilst ensuring that it maintains efficiency and optimum performance. This layered design allows the second layer of wallets and third party apps to use the entire network without downloading or processing the entire blockchain.

In exchange for this computing work supernode owners get a daily XEM reward, divided evenly among all supernode owners. Currently this reward is about 320 XEM per supernode per day.

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