#1
i put on my gibson some straplock(dunlop) but i didnt screw in anything but it fells pretty tight so i dont know if i should screw or what
#2
What? How did you get the screws in if you didn't screw them in? If they're just sitting in the screw holes, they're liable to pull out. Cue broken guitar, tears, end of a dream.

Screw the straplocks in. If the original screw holes are too wide, plug them with toothpicks and THEN screw them in.