This is a little tutorial on how I attach my lanyards.
First I cut the singed ends of the core cords. Then I wrap them in scotch tape wrapped in a spiral so it comes to a point. Then I feed those ends through the loop at the other end of the lanyard. At this point I thread the tape wrapped ends through the lanyard hole in the frame with the lanyard entering the side toward the shooter and exiting the side away from the shooter. The I feed the tapped ends through the cord lock. Now I take the tape off and re-singe the ends of the lanyard and tie the ends in a knot. I am including pictures to hopefully make my instructions clearer. Also if you have questions I will do my best to answer them.
This is how I do it, but you can do it how it suits you. As long as it works for you go with it