Canon PIXMA MG5500 Series Setup Manual page 10

WEP
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7. Select the WEP key number you want to use.
8. Press the OK button.
9. Press the OK button.
10. Enter the WEP key.
Character entry is case-sensitive.
11. Press the left Function button.
12. Make sure that the WEP key is correct.
13. Press the left Function button.
14. When the left screen appears, press the OK button.
The network connection setup is now complete.