F1 is a hotkey used in Ventoy. So obviously you do not press F1 when the PC is off or in Windows/Linux. You would press F1 once you have booted to Ventoy.
Just to help you...
1. Boot to Ventoy
2. Press F1 - [Memdisk] should appear at the bottom of the menu
3. Select your ISO file and boot.
Just to help you...
1. Boot to Ventoy
2. Press F1 - [Memdisk] should appear at the bottom of the menu
3. Select your ISO file and boot.