You can access the builder through the 'Builder' menu option in the main nav, under the 'Characters' menu option in the main nav, or by visiting /characters/builder. You can then make the choices that you need to make and have a completed, play-ready character. So, using the builder, you can create a character in minutes, because everything you would ordinarily write down on your character sheet that you just 'get' is already done for you. and instead focusing on those traits and features that require player choice.
Our purpose with the character builder is to streamline character creation by automatically applying all traits and features that are granted to a character by virtue of her race, class, background, etc. You can now build characters! Character creation in D&D is typically a lengthy process that includes significant referencing of books and recording every detail described in those books - not to mention the 'softer' aspects such as forming your character's identity.