You can obtain a RavenCoin address using the official RavenCoin wallet available for Windows, Linux as well as for Mac OS.
Download & Install
Download the correct version of the wallet for your system from official GitHub and head over to it, then depending on your system, install it like you would normally do.
Generate a RavenCoin address
First of go to Settings → Encrypt Wallet to encrypt your wallet. Then Click File→Receiving Addresses to generate an address. In the pop up window hit New and fill a name for your address (Nanopool for instance). Once done, click OK. Finally, do not forget to backup your wallet to be able to restore it if needed.