After slicing the model in Orca Slicer, there is no difficulty in sending it to USB or saving it as gcode and starting it, like classical slicers. After connecting your printer with your IP address, you can start your printing.
After slicing your model, when you press the Print option, two choices will confront you. First one "Export the G-Code File" and the other is "Upload&Print". If you select the "Export the G-Code File", it uploads the G-Code file to your PC. "Upload&Print" directly sends the file to your printer and starts the print if you made the Wi-Fi connection OrcaSlicer.