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1. Install and activate the Jigoshop plugin. Configure your shop and create products.
2. Install and activate the Affiliates plugin. Use the default settings or configure it to your needs.
3. Install and activate the Affiliates Jigoshop Integration Light plugin.
4. A new Jigoshop Integration Light menu item will appear under the Affiliates menu in WordPress. Set the referral rate for your affiliates there.

Note that you can install the plugins from your WordPress installation directly: use the Add new option found in the Plugins menu. You can also upload and extract them in your site's /wp-content/plugins/ directory or use the Upload option.