Program Arduino Mini Pro 3.3/5V with Arduino Uno

Connect RST pin to GND on Arduino Uno - to bypass the UNO's bootloader

Connect 5V or 3.3V to VCC on Mini
Connect GND to GND on Mini
Connect TX to TX
Connect RX to RX

Select in the Arduino IDE -> Tools -> Board -> Arduino Pro or Pro Mini
Select in the Arduino IDE -> Tools -> Board -> Processor -> 3.3V 8Mhz or 5V 16Mhz
Select in the Arduino IDE -> Tools -> Port

Select File->Examples ->Basics->Blink and press Upload button
When uploading appears in the Arduino IDE press the RESET button on the mini.
When you press the RESET button you should see the rx,tx lights on the uno start to blink fast for a short time - the sketch it is being uploaded.

The led on the Mini Pro should start blinking at one second.
DONE. ENJOY.