The WishList Member mergecodes or shortcodes can be inserted into a page or post by using a Classic Block in the WordPress Gutenberg editor.
These mergecodes and shortcodes cover a wide variety of functionality. There are codes that can be used to insert a login form, member details, integration payment buttons, etc.
The blue WishList Member mergecodes or shortcodes inserter will appear in a Classic Block
Inserting Mergecodes and Shortcodes is explained in more detail (including screenshots) in the following Knowledge Base articles.