First, go to your home screen and open the Settings app.
Click "general" to get to your general settings.
Now, click "AirDrop" to see the sharing settings options.
Lastly, choose the setting that fits your goal.
If you want receiving off, so that you won't recieve any AirDrop data, select "receiving off." If you only want to be able to receive data from contacts, choose "contacts only." If you want everyone to be able to AirDrop data to your device, choose "everyone."
Once you've made your choice, you are good to go use AirDrop as much as you want.