Hi @donpro
In order to make use of some of the ACF 4 Custom fields you have to purchase the related add on. For instance the Flexible Content Field but as for the WYSIWYG field it is available for use and you should check to ensure that there is no plugin conflict that could be affecting the working of this field.
Please deactivate your current theme and all the installed plugins to ensure the behavior is not arising from a conflict.
