after selecting properties i dont have a power management tab?

Solution
assuming your trying to configure your Bios or Windows ?

Bios. boots, F1, F2, F10, Del into bios depending on model and look under power
Windows 10, bottom right corner, click on the icon far right all settings, type" power " and search icon, and it will show
assuming your trying to configure your Bios or Windows ?

Bios. boots, F1, F2, F10, Del into bios depending on model and look under power
Windows 10, bottom right corner, click on the icon far right all settings, type" power " and search icon, and it will show
 
Solution