To install Odoo plugins (modules), you can either download them from the Odoo Apps Store or create custom ones. After downloading or developing the plugin, place it in the "addons" directory of your Odoo installation. Then, refresh the Odoo apps list to install the plugin.
After installation, configure the plugin through the Odoo interface, enabling the required features and modules. Ensure that your Odoo version is compatible with the plugin for proper functionality.