Sounds like a joke. Is question: How to edit string in input?
1. Click on input next to "listing url" using left mouse button
2. Click left from "_" sign using left mouse button, or use arrow keys buttons on your keyboard to move into desired position
3. Press 1 time Delete button on your keyboard
4. Click on "-" button on your keyboard
5. Use Scroll wheel on your mouse, scroll down several times until "Save changes" button appear
6. Click on this button
You are done man!