Can't enable timestretch ,, Sansa Clip + ,, please help anyone ?

[DJKZ]

Hi All,
I just loaded Rockbox onto my Sansa Clip + .
Version r29900-110519  .
I CAN get into the Settings , Sound Settings , and can scroll down to
Timestretch .
I can get to the prompt to select No or Yes .
WHAT  DO  I  DO  NEXT  ?
I can't seem to select yes ..
Can someone help ,,, and also explain how to reboot
THANKS ,,,
sorry ,, just swiched back to Version 3.8.1

------------- update ,,,,, somehow I figured it out and it's working ------------