This link will allow you to set up Rithmic and Sierra Chart: Sierra Chart/Rithmic Connection Guide

For all NEW users:

When you first log into RTrader Pro, be sure to sign the two agreements. These are mandatory!! Don’t forget to select NON-PROFESSIONAL.

Make sure you choose Apex for your System setting. DO NOT select Rithmic Paper Trading!ย 

If you encounter issues connecting Rithmic and Sierra Chart, contact Sierra Chart support. Apex Trader Funding offers limited support for NinjaTrader 8 only.