Throwing links at me isn't helping your case.
Sorry, I just thought you might like to have an idea of what you are talking about.
"To claim that existence precedes essence is to assert that there is no such predetermined essence to be found in humans, and that an individual's essence is defined by him or her through how he or she creates and lives his or her life."
Now some people might argue that this means no human nature. I disagree with that, but despite what many here seem to think not all people of one philosophy are exactly the same. There is still human nature, we can just override it. Suicide
proves this. In the end we will die, there is no avoiding it. Yet our body struggles to survive no matter what, it is absurdity. All animals, humans included, have a survival instinct. Suicide absolutely proves that we can override our basic human nature.
So... how do you create your life?
Well, for example, I have studied and obsessed over philosophy as a hobby and as an educated major, making me a philosopher. The action of participating in philosophy defines me as a philosopher. I am a good friend, which is defined by my actions of being there when a friend needs me, although I am not perfect which is created by the negative acts I have caused in the past. I am a lover of music, defined by the act of listening to music, and I am a movie lover defined by the act of me watching movies constantly and knowing useless facts about all those movies and actors I love haha. Soon I will be a law student, defined by the act of studying criminology and law.
These are all basic. To go into everything would take far too long.