We apologize that you did not receive any instructions with the trap. Here is a video that shows how to set the most popular Duke Traps, the 1100 model included:
If you watch this How To Video on setting the Duke Standard Single Door Rodent and Squirrel Cage Trap (1100) you should be able to see how to set it up for your needs. If this doesn't help you get the trap working, we recommend contacting the manufacturer for troubleshooting the unit. You can reach Duke Traps directly at 662-494-6767.