Delete performance...

I would like to clean up my performance database, but can not find how to delete a performance...
Help?

this does not work...
It is also impossible to import performances...
I'm using OS 3.3.0.11973 with rig manager 1.5.41.12185

In fact, what I would like to do...
Clean up the kemper from my collegue guitarist:
- start up to tuner mode while holding the 1st soft key above the display; in the "maintenance" module I go to memory; I push "Initflash" > kemper is empty

Then I connect my USB stick with my backup, start up the kpa, push "external storage" "backup/restore" "backup"...
My backup is then installing, and the kemper restarts...

I set up the date, time, and put my name in the kemper.
All profiles are ok, and working in browse mode.
All performances are available, and working.
Only, I would like to delete some of my performances, and import the perfomances of my collegue guitarist.
In rig manager I can change the profiles... there is communication between rig manager and the kemper
In rig manager performance I can not do anything.
I can not change a name of a performance, I can not delete a performance and I can not import an performance...

I think it is time for a valium...

Edit1: I just connected my own kemper, and I can not change a name of a performance, I can not delete a performance and I can not import an performance...
Strange, because I already have done this...
Must be a problem in rig manager?

I also installed the new 4 release, and everything is working now!
Must have been something with OS 3.3 and rig manager 1.5...
Very curious for the morphing effect...