Can you complete the writing sample after you take the test? I know that it opened eight days before but will it close once you take the actual test? Is there a deadline?

For the time scheduling of the lsat that is done through Proctor U, does anyone know if we need to create an account with Proctor U before scheduling or do we wait for the email to come in with instructions? I tried to create an account but I didn't know what institution to put.