The Linksis tag is used to enable call-to-action button on a product page. You can tag imported products with 'linksis' from the default values section on the linksis app.

Step 1. From the App Menu, click on the App Settings.
Step 2. Click on Default Values.

Step 3. On the tag box, type 'linksis' and click save

Note: You can also tag your imported product from the Admin backend of your Shopify store.