I've used up two-thirds of my USB memory stick, but now it does not allow me to add more. The window says something about a write-on protection which I have to lift, but which I cannot find. Thanks.

You may have inadvertently locked the stick for writing. Try looking for a small switch on the USB stick itself. Try flipping it to the position opposite it's present position.

Let me know if that works for you.

Can I answer here your phrase: "Let me know if it works for you"? I thought the "question" referred to a question one asks Askmehelpdesk.

Thank You for helping. It was a switch on the stick itself that I needed to turn to the opposite side. I saw it. Your greaté!