When you turn on the wireless on your phone your bell network should appear. Selecting that network will prompt you to enter you password (if your network is password protected), once you enter the password the device will connect.
If that is not the problem, is the issue that you can't see your network at all on your device?
With Wi-Fi enabled, you'll be looking for the router's SSID in the list of scanned wireless devices. The SSID will look something like this: BELL123, the last three digits will be different with your router. On most Bell wireless routers, the SSID and password are printed on a label affixed to the exterior of your Bell wireless router. Enter the password and you should be able to connect to your wireless network.