First off there are NO directions that came with this product! After feeling like I had a mental problem from not being able to figure it out, I did a google search and found some user instructions...So I came on here and read this from another user:"3) FIRMLY press on the yellow release button with your thumb and grasp the blade and withdraw it..."The yellow button DOES NOT PRESS DOWN easily. A tremendous effort has to be made and even then I can't get the blade to go in.I almost severely cut my hand in trying to do this. I AM RETURNING IMMEDIATELY!!!