Like it says in that topic, the locoroco game jelly-effect was probably made using animation. So to recreate that effect you just need to animate your sprite to give the effect of jelly.
If you want to make something more complicated, like the examples made by rojohound, you should learn to understand what he did.
If it's too difficult for you at the moment, I suggest trying a different method like animation.
I told my dentist I had trouble with my teeth and asked her to fix it without looking in my mouth..