After your status page changes, you get a letter via snail mail. For me, took about a week. They ask for general days of the week you are available and for any specific dates you are unavailable. Then you snail mail it back. Then they snail mail your date back to you. Its a little tough b/c you might be scheduling other interviews in the meantime and UCLA doesnt let you change days once youve been assigned a date. Good luck!