Once you install MARNI, you will get a notification message in your WordPress admin telling you of the required and recommended plugins with an option to install them.

Alternatively you can go to Appearance → Install Plugins to see a list of the required plugins and to install them.
Once the plugins are installed, go to Appearance → Install Plugins and activate the plugins.

Required plugins
The following plugins are required to set up MARNI:
Kirki
This plugin is required to customize your site in Appearance > Customize.
Meta Box
This plugin is required in order to display/use the custom fields for posts and pages, such as the post layout.
Marni Meta Boxes
This plugin is required in order to display/use the custom fields as well.
Recommended Plugins:
The following plugins are optional and you only need to install them if you want to use their features:
Marni Custom Post Types
Activate this plugin if you wish to display featured boxes on the home page.
Marni Widgets
Activate this plugin if you wish to use the custom Marni widgets on your site.
Marni Share Buttons
Activate this plugin if you wish to display share buttons for each post.
Marni Shortcodes
Activate this plugin if you wish to use the Marni shortcodes on your site.
Intuitive Custom Post Order
This plugin is recommended to sort the featured boxes and your categories via drag and drop and display them in a certain order.
Once the plugin is installed, go to Settings > Intuitive CPO, check the Post Types and Taxonomies that you wish to reorder and click Update. Now you can simply drag and drop items into a certain order.
WordPress Popular Posts
This plugin is recommended to display your most popular posts in the sidebar and show page views
Smash Balloon Social Photo Feed
This plugin is recommended to display your Instagram feed.
MailChimp for WordPress
This plugin is recommended to display a Newsletter Signup Form.
Contact Form 7
This plugin is recommended to display a contact form.
WooCommerce
This plugin is recommended to include a shop page.
One Click Demo Import
This plugin is recommended to import the Demo Content to your site. You can delete this plugin after importing the demo content.