It will likely be labeled, so it should be easy to find in the notification panel. Tap on the location services icon to turn it on.
[header] How to navigate with google maps on an android [title] Turn on location services. [step] Swipe down from the top of your screen to access the notification panel, and look for the icon for location services. [substeps] The icon for location services is located in the row of quick settings in the notification panel, and can either be a circular icon with a dot in the middle, or a tapered pin facing downward, depending on the model of your device.