Welcome.
You can put the G5 in a loop of the profiler.
Signal goes: Guitar-Kemper in- Kemper send- G5 in, G5 out- Kemepr return
Use 1/4" input on the G5, and try L/MONO 1/4" output
This will go through the entire chain of the G5 in the KPA effects loop.
Use 1/4" input on the G5, and try L/MONO 1/4" output
This will go through the entire chain of the G5 in the KPA effects loop.
This. For more sophisticated settings you could also do the 4 cable method and utilizing send/return of the G5.
But you need to tell us what you're after.
Plug guitar into Kemper.
Plug loop out on Kemper to input on Tonelab
Plug Tonelab left/mono into loop in on KemPer
Plug guitar into Kemper.
Plug loop out on Kemper to input on Tonelab
Plug Tonelab left/mono into loop in on KemPer
Exactly. In Kemper terms 'loop out' is 'send', 'loop in' is 'return'.
OP, what do you want to achieve?.
I have the impression you're not clear as to what signal flow you want, or even why you want to use a G5 with the profiler?
Please provide more information.
Give us a good description and I can throw out a nice pictorial wiring diagram. 
