MacBook Air - password forgotten, can't access WiFI
I have an older MacBook Air, and I can't login. I don't remember the password. It gives me the option of trying to reset it by logging in via my Apple ID -- but it won't connect to the Internet (probably an older WiFi password, and it won't let me update the WiFi).
I haven't tried erasing the laptop because without WiFi, I don't know how I could ever reinstall the OS.
The laptop shows in my devices under my Apple ID, but it doesn't give me the option of resetting the password from there.
Any suggestions?
MacBook Air 13″, OS X 10.10