To create a pre-order type of product, go to WooCommerce > Add Product.
Now, scrolling down to Product Data, you will find the “Set as Pre-Order” option, right by Virtual and Downloadable:
Now a new tab called Pre-Order will be created, including all of the options related to this plugin:
Use For sale date option to set the date and time for the end of the pre-order period.
Customize the text of the pre-order button for the product, thanks to the “Pre-Order Label” option. In case you don’t customize it, the default one will displayed, which can be customizable in Label Settings in YITH Plugins > Pre-Order.
And this is what your pre-order product will look like in the product page: