Password protect wifi?

Is it possible to password protect the wifi?  I have a BT broadband/phone package but need to restrict wifi use .... teenagers ....  
Naive question perhaps  but I don't know the answer or how I could go about doing it!  Thanks.

Welcome to the forum. Presumably you're using a BT home hub. This has a wireless key which must be entered into any device connecting to it; it also has an admin password. Both of these are printed on the hub or a card which goes with it.
You can change both of these to anything you want by entering 192.168.1.254 in your browser and navigating to the appropriate settings. That will prevent anyone without the details connecting to the hub, but if the teenagers are yours they probably won't have much trouble cracking it when your back's turned if they're so inclined. The hub also has the facility to restrict use on selected devices to certain times but again it's easy to get round by a determined person with physical access to the hub.
You can click the white star next to this message if you think it was helpful.

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