Hi Stuart,
The steps to start using the plugin are:
1. Install and activate the plugin
2. If you get the theme integration info on the top of admin screen proceed to the integration process by clicking the start auto adjustment button. If you don’t get the integration info it means that your theme is already integrated and you can proceed to the step 4.
3. On the theme integration page select your preffered settings (width, padding etc.) to match your theme and your needs. Click the blue button if everything looks correctly.
4. Start adding your products: go to Products > Add New
5. You can also adjust some settings in Products > Settings e.g. select your custom product listing page, default product image, default attributes, select price format or disable the price completely
If you have any specific questions I will be more than happy to answer.