Ok trying to keep it simple:
You need to remove the wood piece below the barrels and ahead of the triggers. There's a latch for this usually on the underside of the wood piece that you minipulate to do this. You can then pull the wood piece called the forend down and off the gun. After doing this use the lever to open the gun and you should be able to swing the barrels down and off the frame. The gun is now in 3 major pieces. There should be markings on the flat part above and forward of the triggers. We need to know what's marked there.
Jim

The 2nd Amendment IS an unalienable right.