First things first, is the break open lever moving or is it what's frozen up? If it's moving, you'll probably just need to soak the hinge pin area with penetrating oil for a day or two. If the break open lever is frozen up, you'll need to pull the butt stock off and soak the internals in penetrating oil. Butt stock is held on by a bolt accessible under the butt plate just like most shotguns.
These guns are fairly simple in design, but they have a heck of a main spring in them so I don't recommend trying to strip the internals down unless you have a good way to compress and hold that spring for assembly/disassembly.
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