How to go safe mode with command prompt in windows 8

Go to Start Menu tiles and type CMD you will see this

then it will prompt you to Click on YES

Click to input Bcdedit /set {bootmgr} displaybootmenu yes,when completed press the Enter key on the keyboard. If you need to cancel the prompt to enter options at startup, simply change Yes to No. 

Once completed, please restart your computer and press F8

then you are able to go Safe Mode in Windows 8.