I don't know that you can do it once they are dried. Next time, shape them before they dry. You can lay them on flower formers or foil that is crumpled up a little.
Hmmm I don't think that you can do that once they are dry. They will probably break.
I only use MMF. In this case, I would put them in a humid environment. For instance, in a big tuppeware, put a wet cloth (with warm water should be better). Put the fondant figure inside WITHOUT TOUCHING the cloth. Close the tupperware and leave it there for a night. Or heat a little a glass of water on the microwave, them place inside the poinsettia and leave both things over night there.
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