Where to find "Adapt SI Encoder" Softkey

I just finish all I can do in Siumerik Operate 4.5 through VNC view,  if I de-active SI function, $MA_SAFE_FUNCTION_ENABLE = 0 and p9501 =0, everything was OK, the motor can be moved freely.( i use 1FK7 motor with 1-encoder system),

But if I active SI function, $MA_SAFE_FUNCTION_ENABLE=43H, p9501=43H, then I perform  Active driver start-up->deactivate driver start-up->Copy SI->Confirm SI, then there is no alarm in VNC viewer. But once I press traverse key in HT8,  alarm 201711 with code 3 appear, according to alarm description, it seems I need assign safety encoder. so I carefully check the manual, and found there has one step can not procedure by Copy SI, the manual said that I need press 'Adapt SI encoder' softkey in HMI advance, I running the HMI advance 7.3, but I still can't found this "Adapt HMI" softkey.

Can anyone give me some instruction how to access this softkey? 

NCU 710.3B with SW4.5 SP4

SINAMICS BOOKSIZE COLDPALTE10KW SLM

SINAMICS BOOKSIZE COLDPALTE 5A DMM

1FK7-xxxx-1RB0 motor with absolute encoder

HMI advance 7.3 running on windowsXP