[header] How to use a light meter [title] Prepare your camera. [step] Go into the settings of your camera and set it to manual mode, if it isn't in that mode already. Set your camera to your preferred iso and aperture settings. 
You'll need to do some experimenting with both of these settings to find the ideal settings for the photo you're trying to get. [substeps] The iso setting determines your camera's sensitivity to light.