To lock a game camera to a tree, you'll need an appropriate mounting bracket and/or strap. First, attach the bracket or strap around the trunk of the tree according to the manufacturer's instructions. Securely tighten it so that it won't come loose in any weather conditions. Next, place your game camera onto the mounting bracket and use either screws or cable ties (depending on what kind of mount you have) to fasten it securely. Finally, use a padlock or combination lock to secure your game camera in place and prevent anyone from taking it without permission!