Is there any computer connected to the router ?
If not then you will need to connect the computer to the router.
Do not change any wireless settings on the router with the wireless computer.
you will need to connect the computer to the router with the Ethernet cable.
check the IP address of the computer.
open the router set up page of the router.
Here you can change the wireless settings of the router.
Now once you change the network anme and security on the router, you will need to connect to the wireless network on your wireless computers.
Click Here for step by step instructions

OK, I want you to remove the power and then find the little hole at rear and reset this unit, this will reset to factory, specs. Now try to reset again. You will have to re-set it up all again..Do it with a wired connection through the Ethernet port. in case you don't have a manual have included a link below... have a refresher look, perhaps you are overlooking something? en-us-support.belkin.com/app/answers/detail/a_id/355