Make sure hair is completely dry before use. Make sure hair is combed and detangled before use. Take small sections of hair for optimal results. This tool has three settings: Off, Low and High. For fine to medium hair, use the low setting. For medium to coarse hair, use the high setting. Once you have finished styling, turn off and unplug the tool. This tool has a polarized plug (one blade is wider than the other). As a safety feature, this plug will fit into a polarized outlet only one way. If the plug does not fit securely, reverse the plug. If it still does not fit, contact a qualified electrician. Do not attempt to defeat this safety feature.