Stuck with system and grub

I had the bad idea of wanting to try jingos
I am completely blocked
I can no longer install another system.
Jingos launches but there is no wifi, and no virtual keyboard. (wifi appears when i installed jingos, i can’t wrote my password, i rebooted wifi disapear !)
Grub is not displayed at startup, I have access to it by staying pressed on escape, but there is no option for me to boot on a usb key, it is in command line, and I do not understand anything.
please help me

i have a lenovo miix 320 , and boot is only uefi , i can’t boot directly to usb with bios , i had no problems with android x86 distributions