Sounds like you've broken the internal frame of the seat, all your weight will be on that section getting in and out, the clicking sound may be the broken ends hitting together.
First make sure it's actually internal ie not the under carrige or slide section of the seat, if it is internal undo the clips on the bottom cover and take it off, see if you can find out what's broken you may also need to remove the foam base. If it's the frame you'll need to weld it up.
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