Resetting Arduino Pro Micro

I recently got an Arduino Pro Micro, and installed code onto it so that whenever it is plugged back into my

computer, it spits out the letter "r" over and over again, interfering with letting me install other code into

the Pro Micro. Is there a way to reset the Pro Micro? I connected the RST (Restart) with Ground using a

jumper wire, but it just stops the 2 red LEDs from blinking on the board and does not restart the board.