How to use navigation keys in TWRP if touch bottom part is not working

If our mobile navigation keys/Navbar is not working we can navigate by downloading many apps, but in recovery mode we can’t use that. - The Best Popunder Adnetwork

To fix that we have to do nothing, just enter in Recovery mode and do what you wants to do, if you want to press back key just touch the TWRP logo which is Arrow showing up&down. Twrp logo present at Top left side of the twrp screen.