Long story short, putting the phone back together and alert slider is completely broken.
I can change it to still display volume but I can't put it on vibrate. I have to open the volume slider to change it, and there's no button on the drop down panel like on other Android phones without an alert slider.
I downloaded power toggles but that doesn't work either. No option to change notification or vibrate.
Is there a costom OS I can download or anything I can do?
Oh I'm sorry -- I didn't realize at first that the OP2 has a physical alert slider switch.
Since it's a hardware switch, I'm guessing that you can't control it using software (but I'm not certain). You might have to bring it to a repair shop, or contact OnePlus.