Enable call forwarding: Dial * then 06 followed by the extension number you want to forward too. If dialing an outside line dial 9 + the number.
*06 plus 9 plus the number (if you're forwarding to an outside line). If it's long distance, include 1 + the area code. Pause and wait for the three beeps acknowledging that the forwarding is set.
Disable call forwarding: Dial # then 06 and wait for the beeps.