Programing additional TX134 transmitters

I have a 202U kit that came with two remotes all of which work well. I purchased 4 additional TX134 transmitters at the same time, but never programmed them. I now need to have all 6 transmitters function. How do I program the 4 new ones to do the same function as the other 2 that came with the kit? Thanks.

Hi,
Programming steps can be found below, thanks.