I want to fire decals. Is there any way to vent the lid on a kiln

Raising the lid to the vented position should not activate the lid safety switch. You should be able to raise the lid an inch or so before the safety switch shuts off the elements. If the safety switch shuts off the elements with the lid in the vented position, you can adjust the safety switch. The instructions are listed at this website under Support. Select Instruction Manuals from the drop menu, and scroll down to Safety Switch Adjustment.