Once the app is installed and integrated with your Shopify shop, you should be on the page. The Simile | Similar Upsell Shopify app syncs the products in the background, so there's no need for you to do anything. Keep in mind that the first sync takes about 15 minutes per 1000 products.
Once your products are all synced, your simile widget should be live on your product pages.
Returning back to your store, you'll find the products, 4 items per slide. Click on the first product to see how it looks on the other products. First, check done, then try to customize it a little. Go back to the dashboard, and in the top navigation menu, click on Settings. A new window should appear for additional customization. First, you'll find the widget title, which you have to edit. Next in the line is the number of recommended products; you can set between 1 and 20 items.
The Simile app allows you to add a "Add to cart button" right in the widget, which decreases the risk of distracting customers from their initial purchase. So turn on add to cart button by clicking on the checkbox, and for the Add to cart button text, be creative with it. Save this configuration and proceed to the next step.
If you are a paid member, you can remove "powered by Simile" branding, choose from two different layouts, change colors and fonts.
Also, Simie has got your back in case you want to show your widget in some other place other than under the product description. Just copy the code and paste it in your theme code.
In case you need help, you can reach customer support via live chat in the right bottom corner.