Once again, it's hard to give answer not knowing where you are, so to address your question, I will offer a little bit of timeline for you:

In chapter 6, the pigs change "No animal shall sleep in a bed" by adding with sheets when they move into the farmhouse. This also demonstrates the abandoning of the "All animals are equal"

In chapter 8, the pigs change "No animal shall kill another animal" by adding without cause. This is to excuse the deaths of the animals Napoleon killed for their quote betrayal.

Later in chapter 8, the animals hear Napoleon is dying. He feels better by that afternoon, and then another law is changed, "No animal shall drink alcohol... to excess."

In chapter 10, it is obvious that all are abandoned... commandments 1, 3, and 7 have to do with walking on 2 legs, wearing clothes and being equal. When the animals see the pigs on two legs, they hear the sheep reveal the new maxim: 4 legs good, 2 legs better.

In chapter 9,

This will depend on where the reader is in the novel when asking the question.  The effects of the commandments fall away gradually as Napoleon exerts more and more control over the animals.  For example, while Snowball is still on the farm, humans are still the enemy; however, later in the novel, Napoleon makes deals with the farmers and is seen in conference with them.  Also, Napoleon orders the death of other animals on the farm after they have been shown to be Snowball's allies.  Finally, it is certainly clear by the end of the novel that the animals are not equal, and one might even argue that the animals were never really equal because they operated under a system of unbalanced hierarchy.  So, gradually, all the animals commandments lose their effect.