Please check this site for connecting the Rithmic data feed that we provide, with the NT license you own:
Please also make sure that your NT license is enabled for Rithmic. It if isn't, then our data feed will not show up in your copy of NT. You have to ask NT's customer support to enable Rithmic for your license.
Please note that Earn2Trade does not provide tech support to NinjaTrader or any other platform.