The 35mm strips won,t fit in my holder how should I be inserting them in the holder

The holder that takes 35 mm negative strips on one side and 4, 35 mm slides on the other has a plastic frame that holds the 35 mm film in place. To load film you have to first remove that frame by putting your finger in the opening by the large "A" and popping that end up. The frame fits in only one direction and must be clipped back in by first engaging the two small fingers into openings at the end opposite to the "A" and the lowering the retainer down snapping the 3 sets of 3 clips as you work toward the "A".