Follow the below steps for guidance –
Step 1. Log in to your Shopify store.
Step 3. Navigate to Apps > Recurring Membership App and copy the embed code of the plan.
Step 3. Now, navigate to Online Store > Themes > Actions> Edit code(Published Theme).
Step 4. Open file “product-template.liquid” and search for keyword “cart“(button needed above or below the cart button). After that, paste the copied code above or below it.
Step 5. Save.