Drilling a hole in the center of the hinge slot is NOT necessary with this type of hinge. That slit in the hinge is expressly for helping the CA wick into the slot. (Which is the intended purpose of drilling the hole.)

The advice about orientation is correct. The slit goes into the wing/aileron.

Place the Tpins at the center of the hinge so that half the hinge is in the wing, the other half in the aileron. I usually then remove the pins. Next, simply place a couple of drops on the center of each hinge, turn the wing over and place a couple more drops on each. (Two on each is plenty, you don't want to soak everything with the glue.)

As soon as the last of the CA is placed, flex the joint a number of times to keep the hinge pliable.
Dennis-