Enter your Wi-Fi security key (passphrase or password), and then press

.
IMPORTANT: The Security Key is case sensitive.
Button guide

==> Deletes the letter to the left of the cursor and, when text is entered, deletes the letter on the cursor.

==> Moves the cursor to the right for next character entry or enters a space.

==> Enters letters or numbers. By pressing the buttons repeatedly, you can switch between uppercase, lowercase, or numbers.
For example press

to enter :;<=>?@ !"#$%&'()*+,-./[\]^_{|}~.