I tried making people figures with MMF but can't seem to glue the limbs together. I tried using water to glue. The arms and legs fall off. Same with sugarpaste figures.

You can always use royal icing--that is a good strong glue. Or gum glue which is a mixture of fondant or gumpaste with water. If you are trying to glue dry pieces together, it will take awhile and you may have to set foam pieces under the parts of the figure to hold them in place. Pretty much using foam anytime does help holding the pieces in place while they dry together.

I like to use vanilla and toothpicks for limb joints. And as missyek stated, propping your figure with foam or cottonballs, etc. really helps it stay still and let the limbs attach properly.

Good luck!
Angie