It appears our directions were lost and we can't seem to figure it out. I bet it's easy, but we've pushed and pulled the part on the end and can't make it move. So is there a release of something?

Thanks

The big end at the rear of the stapler needs to be pushed in slightly and then it will release and you refill from the rear. At least I think that's how I used to use the heavy duty one where I worked a million years ago. I looked online and got a picture of your model so I think that's what you are supposed to do.