Acer V3-772G - Windows 8.1, Cant find Startup Settings (like safe mode)

Hello.

I cant find a way of accessing Startup settings in order to access to the option "Disable driver signature enforcement"

I used the 2 following ways:

OPTION 1)

Used a guide from Microsoft (here) and I folloed all steps but I cant find the option.

Here are the pictures:

So I dont see any troubleshoot option..... why?? Shouldnt it be like this: this??

OPTION 2)

Powered on the laptop, pressed ALT+F10 and follow the steps after selecting language and keyboard layout:

Where are the startup options?? How can I start in safe mode?? Shouldnt it be like this: this??

Help??

Thanks you