You lube the running deck under the running belt. Front to rear on the part of the belt you run/walk on each side. About 1/3 in from the edge basically.
Set the speed to 3 and walk on it for 3 minutes and do this every 3 months.
Warren., January 2012
edit
I can answer this question...
where do i lub. my belt at on my cadence 10.0 tredmill?