If you can't find a little hex set screw(Allen wrench) along the sides somewhere and no one answers your question, I would suggest you simply call Delta.
It almost looks like you may have drilled something out.
EDIT: If you did remove the set screw and are having trouble lifting it that's a another problem that should be discussed.
Unscrew the gold tops of those handles and there should be a screw underneath. The hole you drilled is off center so you can’t see the screw from that location.