I don't think it works in the way the site says it does.
It is getting you to wish for something, and keep that wish in your head until it happens basically. This is something you can do without the use of a website.
If you say something to yourself like "I will get better at writing." And keep that wish at the forefront of your mind, while trying to get better at writing, chances are, your wish will come true. You put the effort in, had a desire for it, and made sure you were doing everything in your power to make it happen.