Hi
@BobbyBoyGaming
You can open the screw with a small coin or a flathead screwdriver. Normally, if your set is the V.4, some kind of key would be included. Looks like a T, black plastic and with the ACool lettering.
Regardless of the manufacturer, you should always rinse all components with distilled water before installing them, especially the radiators properly. Since these can contain more residues due to the soldering.
Best Regards