[9/11 RSX-s]

So how do you set the readiness?? Like i click on set readiness but nothing happens please help.

What do you expect to happen? Any existing DTC's will be cleared from the Error Codes window (Windows | Error Codes) and the status will be set to pass for the supported tests. Of course, the ECU repeats these tests eventually, so the DTC for no cat will come back.

Oh, and you need to have the ignition in the On position. Set Readiness is not a save-and-upload sort of command; it is a live command.