You to to My Mibba.
On the right, you'll see boxes with orange headliners.
You scroll down to the one that's called STORIES.
You click on Stories
You'll see "Add new story" and you click it.
And then you fill in the appropriate information where it tells you to.
And under the tab layout, there's tons of pre-made layouts. I always choose one of those because I'm lazy and never bothered to learn how to make layouts on here.