When your detecting the signal and then trying to connect to the router have you entered the wireless network password ? It should be asking you for the password , has it done that ? To find your network password ;
If you go to a computer that is currently connected to your wireless network and open the control panel. Select Network and Internet and then select Homegroup , then select Print and View the Homegroup Password. The next page will have your wireless network password.
Also if you go to the network and sharing page you can select to join a wireless network and then just follow the prompts and have the wireless password handy.
You should write this password down so that you have it when needed.