Right – here is a step by step guide that should help you deal with this.
Open your web browser and type the router IP address of the router (by default, the address is http://192.168.2.1.) in the address bar and press Enter.
Click Login on the top of the page to login to the router. By default the Password is left blank, click Submit.
On the left hand side, you will see a menu. There is a ‘Wireless’ heading in it, and under that, there is an entry called ‘Channel and SSID’. Click on this.
On the screen that now loads, there will be an entry called ‘Wireless Channel’. This will be a drop down box. Click it, and select ‘2’.
Then click ‘Apply Changes’.
The router will need to reboot.
This should now have set the wireless channel to channel 2