Adding recessed LEDs to existing ceiling fan/light circuit - where to tap?
Ed Beal has it right but you need to think about how you want to control the lights. If in parallel with the fan any time the fan is on the LEDs will also be on which is okay if that's what you want. So with the wall switch on, the LEDs will be lit. You can turn off the fan with the remote but the LEDs will be on as long as the wall switch is on. In other words you can't have the fan on and the LEDs off.
If the wire gauge is sufficient you can pigtail into the fan light which will be the wires coming out of the wireless receiver going to the light. In that case the LEDs will activate whenever you turn on the fan light with the remote. Just a thought.