Once you have the plugin installed and activated, a Personalize option will appear in the Block Settings sidebar in the Gutenberg Editor when you are editing a block. Within this, you will be given the choice to choose a rule and determine an action if that rule is met.
For instance, you may wish to add a content block with a message that is only shown to the user if they come from a particular country, or if they have purchased a product from your store. Feel free to play around and let us know if you think what more we could add as default rules out of the box.