probably, that was my dd2. I asked my dh, who is a programmer so does the technicals in our house. It's based on BT, and this is my (possibly garbled) translation:
"Every router has an IP address. You can find it in the router's manual, but it's often a default address, usually 192.168.1.254. You type that number into the address bar of your browser on your local wifi network. That brings up the web interface of your router. The Home Page shows a list of devices that are currently active on your wifi network. (So if a device is switched off at the moment it won't show).
"You'll see links to other pages of Settings, etc. If asked for a password, it doesn't want your usual Wifi password: it's the router's own password that (on BT) is printed on a little flip-out card thing that comes out of the hub. It'll say something like 'Admin Password'.
"You can change settings for specific devices on this list, but knowing which device is which can be tricky.. Each device is shown with its IP address and some sort of network name that may or may not make it obvious which device it is. If it's a PC, it's often a name you gave it when you set it up. If it's one of several phones in the house it can be harder as they'll just be identified as, e.g., 'Android', and a number. You might just have to use trial and error, switching off for one device at a time to see which one loses its wifi.
"The place where you set specific devices to have wifi or not between certain times is in the Settings page, under (for BT) 'BT Access Control'.
(There's also a place called 'Advanced Settings' on BT that shows all devices that have previously connected to your wifi, whether they're currently switched on or not. Dh thinks that you can change wifi times on there as well.)
Ahem. Clear as mud, eh? 