What does "sig" mean in the alarm mode?

Usually on digital watches, "sig" means signal, which means the watch will beep every hour, on the hour. Not something I want for school, public, or really anything. I dont need a reminder the hour changed.

How do you shut off the sound so it won’t beep every hour? Thanks!

Press bottom left button until “AL” or alarm screen displays. Then press top right button until the “SIG” symbol and “alarm” symbol no longer display.

My watch keeps switching over to 24 h without me adjusting it. How do I change the time back to 12 h?

The button on the upper right hand part of the watch controls this feature. Pushing it switches between the 12 h and 24 h display. Perhaps you are somehow pushing it by accident.

How do you turn on this watch?

Mine came turned on out of the box. As I sit here wearing the watch, I can't find an on/off switch. If yours has no time display perhaps it's a defective unit.