The dude who came didn't even put it together he spent 4 hours putting a new line in then he was gone :/

The dude who came didn't even put it together he spent 4 hours putting a new line in then he was gone :/
Do you have the router make and model available? That way you could get suggestions on how to set up a password and access the control panel.
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Yeah if you find your routers model number and do a search for it, maybe try your ISP's support services, some have forums, faq's with the info.
If the guy didn't do anything with the router, it should have a default username and login. Some are just the same for each router, some use stuff such as the serial number, the best bet is to look up your make.
Once you've found the routers IP and the default login details you can easily go in and change settings. You need to encrypt it with a key. For example if someone tries to get onto my net they need the WEP key.
plug the router in via ethernet and edit the settings that way. If you don't know what the router IP is, then look at the gateway IP. My TalkTalk router IP is 192.168.1.1
to stop your neighbour from using your network, put a password on the network (WPA2-PSK if possible), disable SSID broadcast and then setup MAC address filtering (probably going a bit overkill though)
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