Yes, Y the batteries, use 1 & 7 for your elevators. If you made your way into the deluxe menu then you have already turned off BASIC. Look for a "D-EL" mix. It will show "INH" by default so hit the "YES" button once to change it to "ACT". That's it!

if your lucky the elevators will work as needed. If they go opposite each other or backwards from the stick, go into servo reversing and change 1 or 7 or both.