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First, it is advisable to connect your computer to your router with the supplied ethernet cable. It is possible for you to put the device into a state where you cannot access it via the wireless connection – if this happens you will be required to use the cable anyway. On most computers you can connect both wirelessly and wired at the same time, so you can test your settings each time you change them.

The following is paraphrased from your router’s manual:

Using your Internet browser, you can access the Router’s Web-Based Advanced User Interface. In your browser, type “192.168.2.1” (do not type in anything else such as “http://” or “www”) then press the “Enter” key. You will see the Router’s home page in your browser window.

Configuring the Wireless Network Settings
The “Wireless” tab lets you make changes to the wireless network settings. From this tab you can make changes to the wireless network name or Service Set Identifier (SSID), operating channel, encryption security settings, and configure the Router to be used as an access point.

Changing the Wireless Network Name (SSID)
To identify your wireless network, a name called the SSID is used. The SSID is your network name. The default network name of the Router is “Belkin N1 Wireless” followed by six digits that are unique to your Router. Your network name will look something like “Belkin_N1_Wireless_123456”. You can change this to anything you choose, or you can leave it unchanged. Keep in mind, if you decide to change your wireless network name, and there are other wireless networks operating in your area, your network name needs to be different from other wireless networks that may be operating in your area. To change the SSID, type in the SSID that you want to use in the SSID field (1) and click “Apply Changes” (2). The change is immediate. If you make a change to the SSID, your wireless-equipped computers may also need to be reconfigured to connect to your new network name. Refer to the documentation of your wireless network adapter for information on making this change.

Changing the Wireless Channel
There are a number of operating channels from which you can choose—in the United States, there are 11 and in the United Kingdom (and most of Europe), there are 13. In a small number of other countries, there are other channel requirements. Your Router is configured to operate on the proper channels for the country in which you reside. The channel can be changed if needed. If there are other wireless networks operating in your area, your network should be set to operate on a channel that is different than the other wireless networks. The default setting is Auto, however, if there are a number of other wireless signals around you, you will need to try different channels until you get the best one.

Try a channel number at the opposite end of the range that it’s currently on – ie if it’s on 11, try 1, if it’s on 1 try 11, etc.
Scroll Down and press the apply button to save your changes to the settings (they will be applied immediately.) The improvement may show as a strengthening of the signal from your router, so check for that first.
If your wireless connection still hasn’t improved, you will need to try all the channels 1 through 11 and see if any of them offer improvement. If you have a lot of neighbours (for example if you’re in a block of flats) there may only be a few clear channels. Remember to press the “apply changes” button after any changes.