Log on to your router via the internet. If you're using a Linksys router, then type in this IP address into the address bar of your web browser (press Alt+D, if you don't know what the address bar is): 192.168.1.1
You will need to enter a password. If you haven't changed the password, the default password should be as follows:
Default user names:
Linksys BEFW11S4, WRT54G: admin
Linksys EtherFast Cable/DSL Ethernet routers: Administrator
Linksys Comcast routers: comcast
All other Linksys routers: [none]
Linksys BEFW11S4: [none]
Linksys Comcast routers: 1234
All other Linksys routers: admin
Where the word [none] is listed above, no name or password is required. Simply skip or press the Enter/Return key when prompted for those settings.
Once you've logged in, do this:
click on wireless
then wireless security
then you will see the page with the wep key listed.
use the first wep key listed.
If you're not using a Linksys router, please provide the make and model number.