Ok jar spells are spells made by putting things in a jar, or bottle, saying words of power, and then preforming a certain action (depending on the spell) And are usually are broken by doing something to the jar.
Lets use an example:
Needed: a jar (started as a jar spell, but more people tend to use ziplock bags for these spells, due to the fact that a bag will compress in the back of a freezer, but a jar wont)
Photo of the freezee
Method: Take the picture of the freezee (person being frozen) and fold it 3 times.
2: tie it 3 times with the black ribbon and but it in the jar.
3: fill the jar with water and put it in the freezer
That is a basic freezing spell to freeze someone from your life. Words of power would make the spell more powerful, but that was just "basic"