Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Training / Qualification; Communication Breakdown; Other / Unknown
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Other / Unknown
Flight Crew Became Reoriented
Human Factors
I was PM.  On initial climb passing 1;500 feet there was no power reduction as programmed on T/O page X.  I reached up and manually reduced power then checked T/O page X to find it was in fact still programmed properly. Passing 3;000 feet the speed bug did not bug up for flap retraction.  That is when I realized VNAV was not selected. I selected VNAV.  We retracted the flaps on schedule and continued the flight to destination.I have low experience with only 40 hours on the aircraft.  My Relief Pilot also was not yet consolidated and my FO just recently consolidated.  I must have incorrectly responded 'checked' to the 'MCP' challenge on the before Start checklist and missed that VNAV was not selected.Fly more often.  But hard to do under COVID. Be more deliberate in accomplishing checklist especially at the gate before airborne when stress and task demand is low.
Departing ZZZZ at 1;500 feet power did not reduce to climb power. The Captain checked the takeoff pg X for altitudes; they were correct. At 3;000 feet the speed bug did not bug up for cleanup; that's when the Captain realized VNAV was not engaged. He engaged VNAV and I called for flap retraction on schedule.Cause - Recency in right seat. Monitoring. Refrain from staying heads down in the checklist. Confirm selected items.
Air Carrier flight crew reported not following SOPs during the takeoff and departure phase and forgetting to select VNAV mode resulting in a delayed flap retraction. Captain stated lack of flying contributed to the event.