Welcome to the forum, John. I don't have a drop, but looked at a few pictures. Blue light comes on during charge and pulses until fully charged. In use the blue light indicates 50% charge. Red light is less than 50%. The light, when you take a puff, is difficult to see as it is on the top side of the
tank and doesn't stay on long after the puff. This is an auto "firing" device and you don't have a fire button.
Are you getting vapor? If not, is the
tank making contact with the two electrical points on the battery portion? Are the areas on the
tank and "mod" clean and dry? Is the drop new? If so, you need to remove the plastic strip that covers the battery contacts.