Samsung PL64E8000GFXZP - Manual (Page 137)

N You can enter the Security Key
(Security key or PIN) using
a keyboard screen. Enter the
Security Key using your remote.
N You should be able to find the
Pass Phrase on one of the set up
screens you used to set up your
router or modem.
6. When done, select
Next . The network
connection screen appears and the
verification process starts.