Rithmic Trader Pro does not currently allow you to see past trade performance on prior days. It does offer a feature which will show your performance during the current market day. You would need to view it before the new market day opens (Asia) at 18:00 EST. A trade platform like Ninja or other you may be using to place your orders could be preferable to view performance.
Warning: Do NOT engage in any trading activity with money you cannot afford to lose. Day trading can be extremely risky and offers no guarantee for success. You should not fund day-trading activities with retirement savings, student loans, second mortgages, emergency funds, funds set aside for purposes such as education or home ownership, or funds required to meet your living expenses.
If you engage in day trading activities, set a budget and do not spend beyond your set budget.