First, ensure that your Mevo Boost is charged. A fully charged Mevo Boost can give your Mevo camera up to 10 hours of battery life.
Mount the camera on top of the Boost as described here.
The camera will not start charging until Mevo Boost in turned on.
When you open the Mevo app, you will see two battery indicators in the opening card as well as in settings. The longer battery icon displays the battery level of the Boost, while the shorter battery icon indicates the battery level of the camera. The percentage shown is the Boost's battery percentage.