Computer Help and Support

which he did not get unless you gave it to him.

Probably (just guessing) you gave him your wifi password (the key used between various wireless devices and your router to encrypt the transmissions).

He won't be able to use that unless he comes back to your house (or parks someplace near your house or apt).

Still, I would change it. log into your router by pointing a browser page at the router device... usually by opening a new browser page and entering http://192.168.1.1 or maybe http://192.168.0.1 or possibly http://10.0.0.1 and then entering the admin account name (typically "admin&quot and the password... then follow the menu selections until you get to wifi security and change the wifi password there... and then follow the instructions to reset the router)

you will have to go to each device that normally associates with the wifi router (laptops, IoTs, cell phones) and enter the new password for wifi.

If, on the other hand, you DID give him the admin password, you will need to follow the instructions to change that... as he COULD (potentially) log into your router from anywhere on the internet (this is harder to do than it sounds).. and do things that could make your life miserable.