Hi Maria, I'm sorry you are not having luck with your JT27 stapler. Unfortunately you did not purchase the correct staples for this tool. The JT27 Stapler uses the JT21 staples in a green box. The staples come in 3 different sizes (1/4", 5/16", 3/8"). You can purchase these staples online or at your local Home Depot or Lowe's Store.
As for opening the tool - please see the attached picture for assistance.
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