get rid of the wired router.
Now connect one of the computers (it doesn't matter which one) to the wireless router via any one of its LAN ports. Use the cable that came with the router, and connect the other end to the computer's LAN port.
Plug the broadband phone line cable into the port on the back of the router - it can only go in one socket, and that's clearly marked.
Now plug the router into a power socket and turn it on.
Launch Internet explorer on the computer and type the IP address provided in the router's setup manual into the address bar. Press the enter key and login to the router using the username and password provided in the manual (often these are 'admin' and 'admin')
Once into the configuration pages, follow the setup manual to the letter, entering your ISP login details in the appropriate place. When you've finished, save the settings to the router as instructed and watch while it logs you into your broadband account - you'll see the various lights flashing as it connects.
Once the connection is established you can sht down Internet explorer and connect the opther computers - either via LAN cables or via their wireless adapters if they're installed.
You should now be able to access the internet on all the machines. If you have problems, try disabling any firewalls that you have turned on.