You can follow the steps below:

First of all, the capture card should be connected to the computer usb interface, the cell phone interface with the screen to connect the usb cap

First of all, the capture card should be connected to the computer usb interface, the cell phone interface with the screen to connect the usb capture card and the cell phone interface, with the screen above the device there is also a USB interface, you can plug directly into the computer usb interface, if more than 3 usb devices, it means that the usb device capture card has been recognized.