Edimax Technology EW-7722In - Manual (Page 44)

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7. If the access point is protected by encryption, you have to input its
security key or passphrase here. It must match the encryption setting
on the access point.
If the access point you selected does not use encryption, you’ll not be
prompted for security key or passphrase.
8. If you can see ‘Connected’ message, the connection between your
computer and wireless access point is successfully established.