RTrader Pro is limited in that regard. It does have an option to view your performance during the CURRENT Market day. But you cannot look at a span of dates or back on any previous days.
Other trading platforms you may be using such as Ninjatrader.. has more functionality to view Trade Performance.
For Ninjatrader8, on the Control Center, click "New," and then "Trade 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.