I have already set up the wah and volume pedal but Can it be possible to have whammy pedal all set up on the same mission pedal on each profile ?
Page 126 of the Main Manual should help. There is also a hyperlink on that page to a video about setting up pedals. They will explain it better than my typing efforts.
I am not able to connect my Kemper Stage to RM on my Mac. I am connecting USB-B to USB-C and I have also updated RM to 2.1.76. I am using the same cable to connect my old Kemper and that works fine so I don't think it's a problem with the cable. Would really appreciate any insight or advice on what to do! Thanks!
RM 2.1.76 is not compatible with the Stage (see Kemper website, support, downloads).
You will need to download RM 2.3.8 beta (which offers an update to 2.3.9 - check the include betas in you RM preferences)
Things are changing regularly so keep an eye out for updates.